[Q]: Determine the topic of the question-answer pair. Question: "who rules communism government?"; Answer: "It has a form of government characterized by single-party rule or dominant-party rule of a communist party (referred as Dictatorship of the Proletariat by its proponents) and a professed allegiance to a Leninist or MarxistLeninist ideology as the guiding principle of the state."? Topic:
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[A]: Communist state

[Q]: Determine the topic of the question-answer pair. Question: "how many days does the chinese new year last?"; Answer: "9 12 February (Vietnam)"? Topic:
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[A]: Chinese New Year

[Q]: Determine the topic of the question-answer pair. Question: "what freezes faster? hot or cold water??"; Answer: "The Mpemba effect, named after Tanzanian student Erasto Mpemba , is the assertion that warmer water can freeze faster than colder water."? Topic:
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[A]: Mpemba effect

[Q]: Determine the topic of the question-answer pair. Question: "what are the different types of cross country skiing?"; Answer: "Cross-country skiing is part of the Nordic skiing sport family, which includes ski jumping , Nordic combined (cross-country skiing and ski jumping), Biathlon (skiing and rifle marksmanship ) and ski-orienteering (which includes map navigation along snow trails and tracks)."? Topic:
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[A]:
Cross-country skiing