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 Input:
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 Output:
B

Ex Input:
Fact1: Roundworms may be free-living or parasitic., Fact2: Roundworms make up the roundworm phylum, Nematoda., Question: What can the phylum Nematoda be? (A) dangerous (B) parasitic (C) horses (D) meiosis (E) more abundant (F) graptolites (G) homogenous (H) phytoplankton

Ex Output:
B

Ex Input:
Fact1: sound can be used for communication by animals, Fact2: Animals use both ears to localize sound., Question: What do animals utilize to localize sound? (A) feet (B) toes (C) hands (D) four limbs (E) hormones (F) nervous system (G) Their Ears (H) heat energy

Ex Output:
G