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

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

Example Input: In which city will the 2014 Tour de France begin?
Example Output: 2014 tour de france

Example Input: Newcastle United striker Demba Ba plays international football for which country?
Example Output:
demba ba