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:
What U.S. state borders four Great Lakes?
answer:
michigan


question:
Which series had the characters Felix Unger and Oscar Madison?
answer:
the odd couple


question:
What unit of length is defined as the mean distance between the earth and the sun (approximately 149,597,871 km)?
answer:

astronomical unit