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

Example Input: What country has an official residence called Blair House, kept for guests of the leader of the country?
Example Output: blair

Example Input: Although it was headquartered at Oak Ridge, TN, and the University of Chicago, what was the name of the WWII project that created the atomic bomb?
Example Output: nuclear weapon

Example Input: Which Russian painter, who died in 1944, founded the 'Blau Reiter' group?
Example Output:
der blaue reiter