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: wind and rain cause erosion, Fact2: Water, in the form of rain, is the most effective agent of erosion., Question: What causes erosion the most? (A) streams (B) motion (C) LEDs (D) water (E) Roads (F) rivers (G) Winter (H) wind
Example Output: D

Example Input: Fact1: Courtship is behavior that is intended to attract a mate., Fact2: Complex courtship rituals precede mating., Question: What are behavior that is intended to attract a mate? (A) a doorbell (B) firm hugs (C) Complex rituals (D) Riding a bike (E) Behaviour modifications (F) Magnets (G) honeybees (H) Friendship
Example Output: C

Example Input: Fact1: soil is formed by weathering, Fact2: Rocks breakdown by weathering., Question: What helps soil to form? (A) The planting of flowers (B) The breakdown of rocks (C) organic molecules (D) The changing of seasons (E) Organic compounds (F) swamp vegetation (G) evaporation (H) The movement of clouds
Example Output:
B