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: Mutations that lead to cancer usually occur in genes that control the cell cycle., Fact2: Free radicals can mutate genes and eventually lead to cancer or cell death., Question: What that eventually lead to cell death usually occur in genes that control the cell cycle? (A) free radicals (B) acetic acid (C) free cells (D) A Greek letter (E) Localized damage (F) massive damage (G) radical animals (H) free animals
Output:
A