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

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

Example Input: Feb 15, 1564 saw the birth of what famed Italian physicist, mathematician, astronomer, and philosopher, who discovered the first 4 moons of Jupiter?
Example Output: astronomer

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