Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
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Question: Which mediaeval author wrote The Canterbury Tales?

Answer: the canterbury tales


Question: Which evolutionary biologist wrote The Ancestor's Tale in 2004?

Answer: the ancestor's tale


Question: First performed in 1938, and commonly considered one of the saddest of all classical works, who composed Adagio for Strings (it was used in the 1986 film Platoon)?

Answer:
adagio for strings