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

Example Input: Which Bob Dylan song begins You got a lotta nerveTo say you are my friend. When I was down, You just stood there grinning?
Example Output: bob dylan

Example Input: Which English king was the son of Edward, the Black Prince?
Example Output: edward, the black prince

Example Input: Which 1980s pop group, lead singer Dave Gahan, took its name from a French fashion magazine?
Example Output:
dave gahan