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

Example Input: Which of these was the title of Bobby Darin's first million selling single?
Example Output: bobby darin

Example Input: In which range of mountains are the two highest peaks Aconcagua and Ojos Del Salado?
Example Output: aconcagua

Example Input: Who played the part of the vulcanologist who warned of impending disaster in the film 'Dantes Peak'?
Example Output:
dante's peak