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: Evolution occurs in response to a change in the environment., Fact2: Evolution Evolution is the changing pattern of life forms., Question: what happens in response to change in environment? (A) Plant growth is reduced (B) the wearing away of rock (C) lifeforms change their pattern (D) antimatter (E) density changes (F) Warm air moving into cold air (G) erosion from rivers (H) gravity changes
[EX A]: C

[EX 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
[EX A]: C

[EX Q]: Fact1: a refrigerator is used for keeping food fresh for a long period of time, Fact2: Kitchen appliances include refrigerator., Question: What is used for keeping food fresh for a long period of time? (A) Gardens (B) an electric stove (C) A kitchen appliance (D) Fuel cells (E) Plates (F) Air freshener (G) Electric generators (H) electricity
[EX A]:
C