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

[Q]: Mar Chiquita (Cordoba) is the largest natural salt lake in which South American country?
[A]: mar chiquita lake


[Q]: The Bryce Canyon and Zion National Parks are in which US state?
[A]: bryce canyon national park


[Q]: Who led the Muslim forces who captured Jerusalem on this day in 1187, thus ending 88 years of crusader rule of the city?
[A]:
siege of jerusalem