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

Example Input: Which pop group consisted of Huw Bunford, Clan Caren, Dafydd Leuan, Guto Price and Gryff Rhuys?
Example Output: huw bunford

Example Input: The Church of the Savior on Spilled Blood, built on the site of the assassination of Tsar Alexander II, is in which Russian city?
Example Output: church of the savior on blood

Example Input: In which TV series did cousins 'Bo' and 'Luke' drive a car called the 'General Lee'?
Example Output:
bo duke