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: skin is used for breathing air by frogs, Fact2: Frogs belong to the Class Amphibia, and rely on moisture to breathe, reproduce and survive., Question: What do frogs need to survive? (A) food (B) friends (C) Water (D) predators (E) lungs (F) skin (G) warmth (H) desert
Output:
F