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").

Example Input: Fact1: decomposition increases amount of organic matter in soil, Fact2: Fungi are involved in decomposition, as well., Question: What can help increase the amount of organic matter in soil? (A) Fungi (B) mussels (C) pine (D) worms (E) animals (F) Enzymes (G) solutes (H) trees
Example Output: A

Example Input: Fact1: shelter is used for protection by animals against weather, Fact2: Caves or rock overhangs provide shelter., Question: What do animals find protection from when using rock overhangs? (A) sun's heat (B) insects (C) weather (D) erosion (E) rivers (F) bats (G) wind (H) the sun
Example Output: C

Example Input: Fact1: an automobile engine transforms chemical energy into mechanical energy, Fact2: Automobile engines have a range where they are most efficient., Question: The efficiency of an engine range is due to what? (A) Movement of an air mass (B) principals of aerodynamics (C) transportation technology (D) heat production (E) heat is produced (F) A transportation fuel (G) Inches or fractions of inches. (H) chemical to mechanical energy
Example Output:
H