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: All life relies on a relatively narrow range of pH, or acidity., Fact2: Plant life has increased., Question: What relies on a narrow pH range? (A) trees (B) potatoes (C) a fish (D) cacti (E) pine (F) plants (G) Oak (H) bacteria
Output:
F