VB LINQ - Take one random row from each group - vb.net

Question

I'm trying to get one random row from each group of rows. I'm trying to use LINQ, but I'm not sure if that's the right approach. I'd like a Dictionary of Key/Name pairs.
My table is as such:
AnswerGroup AnswerKey AnswerName
---------------------------------------------
1 1 Yes
1 2 No
2 1 Never
2 2 A little bit
2 3 Mostly
2 4 Always
3 1 White
3 2 African American
3 3 Hispanic
3 4 Asian or Pacific Islander
For each AnswerGroup I need to choose a random Key/Name pair.
I have the beginnings of a LINQ query, but frankly I'm lost as I don't understand LINQ grouping and how to add an Enumerable.Take(1) to the group.
Dim answerGroup As String = "AnswerGroup"
Dim answerKey As String = "AnswerKey"
Dim answerName As String = "AnswerName"
Dim query = _
From rows As DataRow In surveyAnswerKeys.Rows _
Order By rows(answerGroup) _
Group By questionSortKey = rows(answerGroup) _
Into questionGroups = Group
Any help would be appreciated. Thanks!
Edit:
I can expand the following query in the debugger to see an In Memory Query that produces a series of DataRows. When I hover over questionGroups it says it's a IEnumerable(Of Object). When I try to run that query into a list or DataTable I get error:
"Public member 'ToTable' on type 'WhereSelectEnumerableIterator(Of
VB$AnonymousType_0(Of Object,IEnumerable(Of Object)),Object)' not
found."
Dim answerGroup As String = "QuestionSortKey"
Dim answerNo As String = "AnswerNo"
Dim surveyDefinitionNo As String = "Pk_SurveyDefinitionNo"
Dim query = _
From rows In surveyAnswerKeys.Rows _
Where rows(answerNo) IsNot Nothing _
Order By Guid.NewGuid() _
Group By questionSortKey = rows(answerGroup) _
Into questionGroups = Group _
Select questionGroups.First()
Dim randomAnswerNos As DataTable = query.ToTable

Answer 1

One quick way to shuffle items is to sort by a "random" value - Guid.NewGuid() usually works well enough. Then just pull the first row from each group:
Dim query = _
From rows As DataRow In surveyAnswerKeys.Rows _
Order By Guid.NewGuid() _
Group By questionSortKey = rows(answerGroup) _
Into questionGroups = Group _
Select questionGroups.First()

Answer 2

Linq can't be used to pull a random row. I'd suggest you store all of the rows in a table and manually loop through each group. Then based on the number of rows in each group, generate a random number and pick that row. Only use LINQ to do the query and retrieve the results.