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

[Q]: What is the largest country in Africa?
[A]: africa

[Q]: Who, as the first chairman of the British Rail Board, infamously directed the huge reduction in railway lines across the UK in the 1960s?
[A]: british railways board

[Q]: Which British author and campaigner for women's rights, born in 1880, was a pioneer of birth control?
[A]:
birth control