In this task, you're given an open-domain question. Your task is to provide an answer to the given question. There is only one unique answer for each question. Your answer should be short, and refer to an entity, date, number, etc. Do not put your answer in the context of a sentence.

Who played the role of lakhan in the movie 'ram lakhan'?
Anil Kapoor

Where can we find the smallest bone in the human body?
middle ear

Who came up with the theory of crystallized vs fluid intelligence?

Raymond Bernard Cattell