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: 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
[EX A]: D

[EX Q]: Fact1: when a metal rusts , that metal becomes orange on the surface, Fact2: Iron rusts in the presence of oxygen and water., Question: Exposure to oxygen and water can cause iron to (A) decrease strength (B) melt (C) uncontrollable burning (D) thermal expansion (E) turn orange on the surface (F) vibrate (G) Extremes of temperature (H) levitate
[EX A]: E

[EX Q]: Fact1: the Earth revolving around the Sun causes the seasons to change on its axis, Fact2: Weather changes from season to season., Question: What causes weather to change? (A) wind and erosion (B) Earth revolving around the sun (C) degrees Celsius (D) exposure to cold (E) Colder temperatures on Mars (F) Forecasting sunny weather (G) pressure differences. (H) Performing a rain dance
[EX A]:
B