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

Example Input: Who married the woman who was to become Queen Beatrix of the Netherlands, on 10 March 1966?
Example Output: beatrix

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: Three of the contiguous states of the USA have Pacific coastlines. Washington and California are two. Which is the third?
Example Output:
pacific ocean