In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

Q: Fact1: the emission of sulfur dioxide causes acid rain, Fact2: The sulfur dioxide is converted into sulfuric acid., Question: what causes acid rain? (A) gases (B) rainfall (C) Pollution (D) fossil fuels (E) emissions (F) vehicles (G) burning (H) wind

A: E
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Q: Fact1: Organisms use lipids to store energy., Fact2: Triglycerides are a storage form of energy., Question: In what form do organisms use lipids? (A) Triglycerides (B) glucose (C) layers of fat (D) adding heat (E) reducing acid rain (F) hydrocarbons (G) recycling (H) By wind and rain

A: A
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Q: Fact1: blowing air into a whistle causes air to vibrate inside the whistle, Fact2: An ocarina is a multiple-tone whistle., Question: What happens to the air inside an ocarina when you blow into it? (A) It expands (B) evaporation (C) moves (D) waves (E) Temperature (F) vibrates (G) It decreases (H) friction

A:
F
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