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

[EX Q]: Joseph Addison and Richard Steele founded (in 1711), and Boris Johnson edited, which British magazine?
[EX A]: boris johnson

[EX Q]: The Cato Street Conspiracy was a plot to kill which British Prime Minister?
[EX A]: prime minister of the united kingdom

[EX Q]: Which romantic film directed by David Lean is set in World War 2 and based in and around Milford railway station?
[EX A]:
david lean