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

Input: Consider Input: Physics. What is the SI unit for amount of substance?

Output: amount of substance


Input: Consider Input: Which strong man appears in the Bible in the Book of Judges?

Output: book of judges


Input: Consider Input: Who wrote the aria O mio babbino caro?


Output: o mio babbino caro