Randomly Inputting Line From Text To Different Labels

I want to randomly input a text line from a .txt to different labels in my program. So far I have this:

Dim FILE_NAME As String = "question.txt"
If System.IO.File.Exists(FILE_NAME) = True Then
Dim objReader As New System.IO.StreamReader(FILE_NAME)
Dim question(5) As String
Dim line As String = ""
[Code] .....

This works perfectly, but as you can see there is no randomization, it just runs through each line. I want one out of every three lines to be chosen. My text file, on each line, has question tab answer tab answer tab answer tab answer tab correct answer. So for the first inputted question i want it to chose one of the first three lines, second question chose a line between line 4,5 and 6. etc.