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

Example Input: What famous song from the film Butch Cassidy and the Sundance Kid won an Oscar for best song?
Example Output: academy award for best original song

Example Input: Who is the current Australian prime minister ?
Example Output: australia

Example Input: Commander Shepard, Jacob Taylor, Miranda Lawson, Thane Krios, Grunt, Jack, Mordin Solus, Samara, Morinth, Legion, Zaeed Messani, Garrus Vakarian and Tali'Zorah Vas Neema are characters in which computer game?
Example Output:
commander shepard