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: Who has written a series of novels, entitled The Dark Tower, of which the first, in 1982, was entitled, The Gunslinger?
Example Output: the dark tower

Example Input: What was the fourth Alien film called?
Example Output:
alien