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

Example Input: The counties of Alameda, El Dorado, Fresno, Marin, Mariposa, Nevada, Orange, Riverside, Sacramento, San Bernardino, San Joaquin, San Mateo, Santa Clara, Santa Cruz, Sonoma and Ventura are in what state of the USA?
Example Output: santa clara, california

Example Input: What is the capital of the American state of Delaware Boise, Dover or Jefferson City?
Example Output: delaware

Example Input: Which American actor and singer has joined Amanda Holden as one of the judges on the current series of 'Britain's Got Talent'?
Example Output:
britain's got talent