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

Ex Input:
Which late 17th and early 18th century British architect designed Brighton Pavilion, Marble Arch, and the plan for London's Regents Park?

Ex Output:
royal pavilion

Ex Input:
In music, which band consists of Billy Gibbons, Dusty Hill and Frank Beard?

Ex Output:
frank beard

Ex Input:
What song was a hit for Tom Jones and Cerys Matthews in 1999?

Ex Output:
tom jones