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: Animals can communicate with sounds, chemicals, or visual cues., Fact2: Unlike animal communication, properly human communication is abstract and linguistic in nature., Question: Which of the following do humans not use to communicate? (A) chemicals. (B) limb amputation (C) emissions (D) sweating (E) smoking pipes (F) dry conditions (G) visible energy (H) heat or cold
Example Output: A

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: Vesicle transport requires energy, so it is also a form of active transport., Fact2: Active transport involves movement of substances against a chemical gradient., Question: Why does vesicle transport need energy? (A) it helps plants in growing (B) to prevent movement (C) for movement of substances (D) during the day (E) Transfers energy (F) flow of electrons (G) to breath (H) magnetism
Example Output:
C