check answer and remove UIButton (Objective-C) - objective-c

Question

I have a series of questions and answers that it's loads randomly,each question have 3 choice, in one of my question I have just true and false,
my questions is how can I set my if statement, That if my answer is true or false don't show the last buttons,
Here is my code:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
NSString *qOne = #"Question 1";
NSString *qTwo = #"Question 2";
NSString *qThree = #"Question 3";
NSString *qFour = #"Question 4";
NSString *answerOne = #"Après le souper";
NSString *answerTwo = #"1";
NSString *answerThree = #" Holstein";
NSString *answerFour = #" yes";
NSString *answer2One = #"Après un exercice physique";
NSString *answer2Two = #" 2";
NSString *answer2Three = #" Jersey";
NSString *answer2Four = #" No";
NSString *answer3One = #"Avant un exercice physique";
NSString *answer3Two = #" 4";
NSString *answer3Three = #" Canadienne";
I want to remove this part
NSString *answer3Four = #" ";
NSString *correctOne = #"Après un exercice physique";
NSString *correctTwo = #" 4";
NSString *correctThree = #" Yes";
NSString *correctFour = #" 14";
answerComments = [[NSArray alloc] initWithObjects: answerOne, answerTwo, answerThree, answerFour, nil];
answer2Comments = [[NSArray alloc] initWithObjects: answer2One, answer2Two, answer2Three, answer2Four, nil];
answer3Comments = [[NSArray alloc] initWithObjects: answer3One, answer3Two, answer3Three, answer3Four,nil];
qComments = [[NSArray alloc] initWithObjects:qOne, qTwo, qThree, qFour, nil];
correctComments = [[NSArray alloc] initWithObjects: correctOne, correctTwo, correctThree, correctFour, nil];
// A random string is selected and assigned to artist.
int rand = arc4random()%4;
NSString *artist = [qComments objectAtIndex:rand];
firstAnswer = [answerComments objectAtIndex:rand];
secondAnswer = [answer2Comments objectAtIndex:rand];
threeAnswer = [answer3Comments objectAtIndex:rand];
correct = [correctComments objectAtIndex:rand];
NSLog (#"%#",correct);
// Here's the problematic code:
[question setText:(artist)];
[question setFont:[UIFont fontWithName:#"HelveticaRoundedLTStd-Bd" size:42]];
question.adjustsFontSizeToFitWidth = NO;
question.numberOfLines = 0;
[test setTitle:(firstAnswer) forState:UIControlStateNormal];
[test setBackgroundImage:[UIImage imageNamed:#"activeBtn.png"] forState:UIControlStateHighlighted];
[ansONE setTitle:(secondAnswer) forState:UIControlStateNormal];
[ansONE setBackgroundImage:[UIImage imageNamed:#"activeBtn.png"] forState:UIControlStateHighlighted];
ansTWO = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[ansTWO addTarget:self
action:#selector(ansTWO:)
forControlEvents:UIControlEventTouchDown];
[ansTWO setTitle:(threeAnswer) forState:UIControlStateNormal];
[ansTWO setBackgroundImage:[UIImage imageNamed:#"activeBtn.png"] forState:UIControlStateHighlighted];
ansTWO.titleLabel.font = [UIFont fontWithName:#"HelveticaRoundedLTStd-Bd" size:24];
[ansTWO setTitleColor:[UIColor colorWithRed:21/255.0 green:119/255.0 blue:183/255.0 alpha:.77] forState:UIControlStateNormal];
ansTWO.titleLabel.textAlignment = UITextAlignmentCenter;
[ansTWO setTag:2];
UIImage *buttonImage = [UIImage imageNamed:#"quizBtn.png"];
[ansTWO setBackgroundImage:buttonImage forState:UIControlStateNormal];
ansTWO.frame = CGRectMake(243, 586,549, 56);
[self.view addSubview:ansTWO];
}

Answer 1

Assuming that you know how to interpret the answer to be TRUE or FALSE you can have some if statement like this:
//1st Option
if(answer){
button.hidden = YES;
//hide or unhide other buttons
}
//2 Option
if(answer){
[button removeFromSuperView];
//add or remove other buttons
}