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: Many corals secrete an exoskeleton that builds up to become a coral reef., Fact2: Good examples are Bubble coral, Elegance coral, Frogspawn and other Euphyllia corals., Question: What is secreted by organisms like frogspawn to become a reef? (A) exocrine glands (B) food and shelter (C) exoskeleton (D) bones (E) Energy (F) Chemical energy (G) plasma (H) Energy.
[A]: C

[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

[Q]: Fact1: a fire requires oxygen to burn, Fact2: Oxygen has eight protons and eight electrons., Question: What does a fire require to burn? (A) A transportation fuel (B) Something with exactly 2 protons (C) chemical to mechanical energy (D) Something with exactly eight protons (E) Something with exactly 1 proton (F) Burning fuel and air (G) igniting fuel and oxidiser (H) Something with 7 protons
[A]:
D