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: Echinoderms use pheromones to communicate with each other., Fact2: All echinoderms are deuterostomes ., Question: What use pheromones to communicate with each other? (A) passenger pigeons (B) honeybees (C) deuterostomes (D) Most plants (E) insects (F) animals (G) huddle together (H) orchids
[A]: C

[Q]: 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
[A]: C

[Q]: Fact1: irradiating food can be used to kill existing microorganisms in the food, Fact2: Irradiation causes chemical changes., Question: what can be used to kill existing microorganisms in food? (A) chemical changes (B) Dehydration (C) deoxyribonucleic acid (D) bacteria (E) an electron microscope (F) hydration (G) electromagnetic energy (H) single-celled organisms
[A]:
A