So they get that caller on the line, and tell them that they're playing "The Answer is ALWAYS 'C'".
The DJ then asks the caller (who is 14 or under based on station rules) a really random trivia question and gives them 3 choices A, B, or C.
The caller guesses A.
The DJ then goes on to the next caller who answers "B".
The DJ askes that caller "Are you sure you want to answer 'B' on "The Answer Is ALWAYS 'C'""?
The caller sticks with B.