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

Ex Input:
What canal opened in Egypt?

Ex Output:
egypt

Ex Input:
What is the capital of the American state of Delaware Boise, Dover or Jefferson City?

Ex Output:
delaware

Ex Input:
Which instrument was played by jazz artist Benny Goodman?

Ex Output:
benny goodman