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

Example Input: In 1459, the Battle of Blore Heath in Staffordshire, England, 2 miles east of Market Drayton in Shropshire, was the first major battle of which campaign?
Example Output: england

Example Input: Who played Lionel Hardcastle in the TV series 'As Time Goes By'?
Example Output: as time goes by

Example Input: Who was the longest-serving presenter of UK children's tv show 'Blue Peter'?
Example Output:
blue peter