instruction:
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").
question:
Fact1: a prism is used for refracting light, Fact2: Refraction is the bending of light cause by a speed change when it passes through different media., Question: What aspect of light changes when it passes from air into a prism? (A) power (B) seasons (C) speed (D) energy (E) a wave (F) Joules (G) heat (H) unique
answer:
C


question:
Fact1: Plants live just about everywhere on Earth., Fact2: Snakes live almost everywhere on earth., Question: Plants and snakes live _. (A) almost everywhere (B) important habitats (C) hydrate their cells (D) reproduce (E) more abundant (F) competing for resources (G) the environment (H) vegetation
answer:
A


question:
Fact1: the emission of sulfur dioxide causes acid rain, Fact2: Acid rain effects forest ecosystems., Question: What causes damage to forest ecosystems? (A) flooding (B) humans disturb it (C) Sulfur dioxide (D) deforestation (E) Liquid bromine (F) Carnivore animals (G) Pollution (H) Hydrogen peroxide
answer:

C