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

Example Input: Which country is currently ruled by the Chakri dynasty that has been in power since 1782?
Example Output: chakri dynasty

Example Input: Who plays Isobel Crawley in the UK television series 'Downton Abbey'?
Example Output: downton abbey

Example Input: Which city hosted the 1992 Summer Olympic Games?
Example Output:
1992 summer olympics