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

[Q]: In May 1940, who became British Prime Minister after the resignation of Neville Chamberlain?
[A]: prime minister of the united kingdom


[Q]: 'Mrs Dalloway' and To the Lighthouse' are among the works of which writer?
[A]: to the lighthouse


[Q]: Which Dickens novel starts with a Thames boatman and his daughter 'Lizzie' searching for bodies in the river?
[A]:
charles dickens