Instructions: 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: rain causes erosion, Fact2: Erosion of rock makes nutrients available., Question: What causes nutrients to be available? (A) water (B) rivers (C) saliva (D) fats (E) Enzymes (F) protein (G) spring (H) Cooking
Output:
A