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").
Q: Fact1: Cells that divide uncontrollably may form a tumor, or abnormal mass of cells., Fact2: When p53 is mutated, cells divide uncontrollably., Question: If a tumor has formed, this gene might have mutated: (A) p53 (B) SNPs (C) OCA 2 (D) DNA (E) gene (F) tRNA (G) malignancy (H) TRH
A:
A