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 Q]: 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 A]: E

[EX Q]: Fact1: Pneumonia may be caused by an infection or injury of the lungs., Fact2: Mammals breathe air with lungs., Question: What may be caused by an infection or injury of the organs used to breathe air? (A) Toxicity (B) smoking (C) fertilization (D) pneumonia (E) a broken leg (F) oxygenation (G) Dehydration (H) the skin
[EX A]: D

[EX Q]: Fact1: changes in the pH of soil can cause plants to die, Fact2: Sulfur lowers pH in soil., Question: Adding sulfur to soil can cause what? (A) contamination (B) flooding (C) plants to die (D) Pollution (E) chemical reaction (F) Greenhouse gasses (G) global warming (H) harmful substances
[EX A]:
C