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: carpooling decreases the amount of cars used to travel to a place, Fact2: Carpooling cuts down on congestion and pollution., Question: What decreases when we decrease the amount of cars traveling to one place? (A) Temperature (B) Heart rate (C) Climate change (D) Pollution (E) Clean air (F) forces (G) Burning fossil fuels (H) gene flow
[A]: D

[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.
[A]: G

[Q]: Fact1: Cells secrete acids and bases to maintain the proper pH for enzymes to work., Fact2: Enzyme mechanisms Enzymes are biological catalysts., Question: For biological catalysts to maintain proper pH, what is needed to maintain proper pH? (A) Fully cooking the oysters (B) raising their temperature (C) Organic compounds (D) Something made from fermented ricce (E) metabolic reaction (F) Chemical energy (G) Something coming from a gland (H) secretion of acids and bases
[A]:
H