Problem: Given the question: Determine the topic of the question. Question: "what caused the world war 2?" Topic:
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The answer is:
Causes of World War II

Problem: Given the question: Determine the topic of the question. Question: "where did the persian war take place?" Topic:
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The answer is:
Greco-Persian Wars

Problem: Given the question: Determine the topic of the question. Question: "how do you know if something is the golden ratio?" Topic:
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The answer is:
Golden ratio