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: In which constellation is the star Deneb?

Output: deneb


Input: Consider Input: Auld Reekie is the nickname for which Scottish city?


Output: auld reekie