Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.

Example Input: Ageusia is the loss of which sense?
Example Output: ageusia

Example Input: Allopurinol is typically prescribed for which illness?
Example Output: allopurinol

Example Input: In which German city are the headquarters of the car maker BMW?
Example Output:
bmw