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

Ex Input:
Who played the title role in the 1955 film 'Davy Crockett, King Of The Wild Frontier'?

Ex Output:
davy crockett


Ex Input:
What is the name of the US electric car manufacturer, founded in 2003, whose cars include the Model S and the Model X?

Ex Output:
tesla model s


Ex Input:
What is the name of Batman's sidekick and ward?

Ex Output:

batman