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

Ex Input:
What is the title of the four-episode special of 'Doctor Who', made for the Red Nose Day telethon in the UK, broadcast in March 1999?

Ex Output:
doctor who

Ex Input:
Brenda Mae Tarpley achieved fame under what name?

Ex Output:
brenda mae tarpley

Ex Input:
Which king of England, Denmark, Norway and parts of Sweden who died on November 12th 1035 is buried at Winchester Cathedral?

Ex Output:
denmark