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

Ex Input:
Ornette Coleman, Louis Armstrong and Charles Mingus are associated with what style of music?

Ex Output:
charles mingus


Ex Input:
Of all the actors who played Doctor Who in the TV series of the same name, who appeared in the most episodes?

Ex Output:
doctor who


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

Ex Output:

alejandro amaya