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

Example Input: Which analgesic drug, first isolated in 1804, was named after the Greek god of dreams ?
Example Output: analgesic

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: Captain Dobbin and Amelia Sedley are characters from which 19th century novel?
Example Output:
amelia sedley