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").

[EX Q]: Fact1: Temperature falls from lower to higher altitudes., Fact2: If the weather is warm, their temperature rises., Question: What falls from lower to higher altitudes? (A) warm weather (B) sun's heat (C) rainfall (D) heat energy (E) kinetic energy (F) water vapor (G) colder and wetter (H) Greenhouse gasses
[EX A]: A

[EX Q]: Fact1: Mammals have a layer of fat under the skin to help insulate the body., Fact2: Glass insulation keeps beverage warm for hours., Question: What keeps mammals warm? (A) evaporation (B) Animal fur (C) staying warm (D) sweating (E) They have thick fur (F) with their fur (G) a layer of fat (H) Veins and arteries.
[EX A]: G

[EX Q]: Fact1: a fire requires oxygen to burn, Fact2: If the oxygen is removed, the fire is smothered., Question: How do you put out a fire? (A) power (B) boiling (C) protect them (D) electrically (E) smother it (F) evaporation (G) mechanical (H) heating liquids
[EX A]:
E