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

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

Ex Output:
amount of substance


Ex Input:
Abyssinian, British Longhair and German Rex are all breeds of what?

Ex Output:
british longhair


Ex Input:
USA athletes refused their silver medals at the 1972 Summer Olympics in which men's sport?

Ex Output:

1972 summer olympics