Definition: 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").
Input: Fact1: chemical weathering causes iron in rock to oxidize, Fact2: Asteroids are typically made of rock or iron., Question: What causes iron in asteroids to oxidize? (A) aliens (B) chemical weathering (C) flow of electrons (D) hydrogen and oxygen (E) water (F) Chemical energy (G) fossil fuels (H) ice
Output:
B