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").

Example Input: Fact1: preventing the transfer of heat from an organims 's body causes that organism to keep warm, Fact2: Body heat is trapped in the haircoat., Question: The haircoat of a dog is useful for (A) recovery time from fatigue (B) When it's cold (C) protect them (D) finding bones (E) preventing dog days (F) keeping the dog warm (G) keeping the dog cool (H) water conservation
Example Output: F

Example Input: Fact1: mechanical weathering is when rocks are broken down by mechanical means, Fact2: Water is a mechanical weathering force., Question: What  weathers rocks? (A) soil (B) streams (C) a delta (D) calcite (E) erosion (F) water (G) grass (H) the sun
Example Output: F

Example Input: Fact1: when light enters the eye through the pupil , that light falls on the retina, Fact2: Humans use both eyes to see a single image., Question: What do humans use to see an image? (A) keratin (B) light (C) heat (D) fibers (E) calcite (F) mussels (G) photons (H) Neuron.
Example Output:
B