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: glass cause refraction of light, Fact2: Refraction Refraction is the bending of light rays., Question: Glass causes the _ of light (A) intensification (B) bending (C) photons (D) a wave (E) Pollution (F) blocking (G) heat (H) amplification
[EX A]: B

[EX Q]: Fact1: skin is used for protecting the body from harmful substances, Fact2: Skin is the body's largest organ., Question: What can protect the body from harmful substances? (A) the body's largest organ (B) layers of fat (C) Electric devices (D) bones (E) sunburns (F) hard outer covering (G) deoxyribonucleic acid (H) muscle
[EX A]: A

[EX Q]: Fact1: Echinoderms have a unique water vascular system with tube feet., Fact2: Each starfish arm is lined with tube feet., Question: What phylum do starfish belong to? (A) fertile (B) animals (C) Echinoderm. (D) Mollusca. (E) Sponge. (F) Absorb light (G) Annelid. (H) a fish
[EX A]:
C