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

Which strong man appears in the Bible in the Book of Judges?
book of judges

Which Union leader of the American Civil War gave his name to a tree in California's 'Sequoia National Park'?
american civil war

Between 1901 and 1904 Which painter's career was described as his 'Blue period' ?
picasso's blue period