Problem: In which ocean is the island of Papua New Guinea
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A: pacific

Q: In the USA, motor neurone disease is often named after which baseball player?
A: lou gehrig

Problem: Which US president ended his country's participation in the Vietnam War?
Answer: richard nixon

Q: Who is the wife of golfer Greg Norman?
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A: tennis star chris evert

Q: Which river flows from the Caspian Sea?
What is the answer?

A: none

question: Answer this question.

Demographics is the study of what?
answer:
human population