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

[EX Q]: The Brooklyn Bridge crosses which river?
[EX A]: brooklyn bridge

[EX Q]: Who served in the Crimean War (1854 - 56), was responsible for suppressing the Taiping rebellion in China in 1860, was governor of the Sudan 1877 - 79, and died there?
[EX A]: taiping rebellion

[EX Q]: Which Dickens novel is subtitled The Parish Boy's Progress?
[EX A]:
charles dickens