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

Which biologist was known as Darwin's Bulldog?
charles darwin

In what story of Arthur C. Clarke do Tibetan monks seek to list all the names of God as they believe He will bring the Universe to an end once this is done?
arthur c. clarke

Who commanded the French and Spanish fleet at the Battle of Trafalgar in 1805?
battle of trafalgar