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

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
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Q: In 2011, Christian Bale won a Best Supporting Actor Oscar for his role as an assistant to his half-brother in which boxing related film?

A: christian bale
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Q: Which 1957 film directed by David Lean was the story of the construction and demolition of a civil engineering work in Burma?

A:
david lean
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