A theory about the individual chase

What evidence is there that the Chaser selects any answers during the Individual chase? Or, if they do, that this is the answer that is used. This is a crucial part of the game that determines the final game. So, some control by the producers would make sense and could be adjusted as the game develops.

I ask because, when I watch the Individual chase, the Chasers give a very vague expression when waiting to hear their answer as though they don’t know what their answer will be.

I’m sure they know the majority of answers but almost seem prepared to give claim they don’t know an answer.

Finally, I was watching an episode just now and saw the Chaser with their arms crossed when their answer was given. I wouldn’t hang my theory on user alone, but more the first suggestion. But it definitely got me thinking.