The interrogative determiners are which and what.
which is a specific determiner
Here are three books. Which book do you think is the most interesting?
They have four boys. Which boy is the oldest?
I can’t remember which house Janet lives in.
Which restaurant did you go to?
what is a general determiner
What food do you like?
I don’t know what job she does.
- Interrogative determiners 1
- Interrogative determiners 2