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: Aging occurs as cells lose their ability to divide., Fact2: Cell division is by mitosis ., Question: What happens as mitosis slows for good? (A) pubescence (B) aging (C) loss (D) fever (E) fusion (F) birth (G) infancy (H) death
Output:
B