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

Example Input: Who was in the films Zelig, Stardust Memories, and Broadway Danny Rose?
Example Output: broadway danny rose

Example Input: What is the official language of the Dominican Republic?
Example Output: dominican republic

Example Input: Which is the most heavily populated city in Brazil?
Example Output:
brazil