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").

Ex Input:
Fact1: All life relies on a relatively narrow range of pH, or acidity., Fact2: Human life is dependent life., Question: what relies on a relatively narrow range of acidity? (A) gravity (B) mammals (C) animals (D) trees (E) humans (F) density (G) volume (H) potatoes

Ex Output:
E

Ex Input:
Fact1: a plants require water for survival, Fact2: Life-long learning is no longer a luxury for the few, but a survival skill for all., Question: Plants require what for life-long learning? (A) Light (B) protein (C) Energy. (D) gametes (E) genes (F) water (G) energy (H) oxygen

Ex Output:
F

Ex Input:
Fact1: astronauts require preserved food for extended flights, Fact2: Preservatives are added to extend the shelf life., Question: What prolongs the storage life of food in space? (A) hydrogen and oxygen (B) preservatives (C) Dehydration (D) heating liquids (E) Fuel cells (F) heat energy (G) hard outer covering (H) layers of fat

Ex Output:
B