instruction:
Given an trivia question precisely answer the question with a word/phrase/name. External resources such as Wikipedia could be used to obtain the facts.
question:
Discovery, Gillyflower and Rome Beauty are types of which fruit?
answer:
apple


question:
Badain Jaran, Gobi, Lop, and Taklamakan are major Chinese what?
answer:
desert


question:
Who wrote the 1798 treatise 'An Essay on the Principle of Population'?
answer:

thomas robert malthus