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

Ex Input:
Alejandro Amaya, Carlos Arruza, Jaime Bravo and Carmelo Torres are famous Mexican?

Ex Output:
alejandro amaya


Ex Input:
What type of creature is an argali?

Ex Output:
argali


Ex Input:
What does a candela measure ?

Ex Output:

candela