instruction:
Given a factoid/trivia type question, generate the topic of the question. The topic is the entity the question talks about.
question:
Which analgesic drug, first isolated in 1804, was named after the Greek god of dreams ?
answer:
analgesic


question:
Which current Broadway musical has a Japanese therapist character called Christmas Eve?
answer:
christmas eve


question:
Which black American won 4 gold medals in 1936 Olympics in Berlin?
answer:

1936 summer olympics