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:
Buried in neither Westminster nor Windsor, where is the tomb of Edward II?

Ex Output:
edward ii of england


Ex Input:
Who recorded the 1968 album 'Astral Weeks'?

Ex Output:

astral weeks