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

Ex Input:
To which actress is Daniel Craig married?

Ex Output:
daniel craig

Ex Input:
Which 20th century British prime minister had the longest surname ?

Ex Output:
prime minister of the united kingdom

Ex Input:
Old television quiz shows - who was the original presenter of the TV quiz show Blockbusters?

Ex Output:
blockbusters