input question: Determine the topic of the question. Question: "where did the persian war take place?" Topic:???
output answer: Greco-Persian Wars

Determine the topic of the question. Question: "what states have legalized prostitution?" Topic:
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Answer: Prostitution in the United States

Q: Determine the topic of the question. Question: "what area code is 810?" Topic:
A: Area code 810

Question: Determine the topic of the question. Question: "how are public schools funded?" Topic:
Answer: state school

[Q]: Determine the topic of the question. Question: "what is a base SI unit?" Topic:
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[A]: SI base unit

Problem: Given the question: Determine the topic of the question. Question: "how much of earth is covered ocean water?" Topic:
++++++++++++++++++++++++++++++++
The answer is:
Ocean