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 Domenikos Theotocopoulos better known as?
Example Output: museum of el greco

Example Input: What was the name of the British India Special Force, the brainchild of British Brigadier Orde Charles Wingate, that operated behind Japanese lines in Burma & India in 1943/1944 during World War II?
Example Output: orde wingate

Example Input: What geographical feature is Bull Run, the site of the battle that was famously lost by troops commanded by General George Custer?
Example Output:
bull run