input question: Determine the topic of the question-answer pair. Question: "where did columbus really land in 1492??"; Answer: "During his first voyage in 1492, instead of reaching Japan as he had intended, Columbus landed in the Bahamas archipelago , at a locale he named San Salvador."? Topic:???
output answer: Christopher Columbus

Determine the topic of the question-answer pair. Question: "who is the CEO OF FACEBOOK?"; Answer: "As of April 2013, Zuckerberg is the chairman and chief executive of Facebook, Inc. and in 2013 his personal wealth was estimated to be US$13 .3 billion ."? Topic:
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Answer: Mark Zuckerberg

Q: Determine the topic of the question-answer pair. Question: "what is tmz stand for?"; Answer: "The name TMZ stands for the historic " studio zone " or 30-mile zone radius from the intersection of West Beverly Boulevard and North La Cienega Boulevard in Los Angeles."? Topic:
A: TMZ (website)

Question: Determine the topic of the question-answer pair. Question: "how south african leaders are elected?"; Answer: "The President is elected by members of the National Assembly , the lower house of Parliament , and is usually the leader of the largest party, which has been the African National Congress since the first non-racial elections were held on 27 April 1994."? Topic:
Answer: President of South Africa

[Q]: Determine the topic of the question-answer pair. Question: "What is Ischemia or infarction??"; Answer: "In medicine , ischemia, also spelled as ischaemia or ischmia, (; from Greek language , ischaimia; isch- root denoting a restriction or thinning or to make or grow thin/lean, haema blood ) is a restriction in blood supply to tissues , causing a shortage of oxygen and glucose needed for cellular metabolism (to keep tissue alive)."? Topic:
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[A]: Ischemia

Problem: Given the question: Determine the topic of the question-answer pair. Question: "what is middle class in the us?"; Answer: "The American middle class is a social class in the United States ."? Topic:
++++++++++++++++++++++++++++++++
The answer is:
American middle class