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: Aging is associated with the death of cells., Fact2: When telomeres become too short, the cell dies., Question: What is associated with aging? (A) Extra cells (B) intelligence (C) forest is destroyed (D) Chemical energy (E) Strong cells (F) oxidation reaction (G) Short telomeres (H) massive damage

Ex Output:
G

Ex Input:
Fact1: lungs are used for breathing air by land animals, Fact2: Elephants are the largest animals on land., Question: What uses lungs for breathing air? (A) rocks (B) some mammals (C) Frogs (D) monotremes (E) humans (F) bacteria (G) elephants (H) oak trees

Ex Output:
G

Ex Input:
Fact1: treating water is used to remove harmful substances before drinking, Fact2: Hydration is maintained by drinking a lot of fluid., Question: What is treating water to remove harmful substances done before? (A) vaporization (B) bacteria (C) evaporation (D) hydration (E) dangerous (F) Frogs (G) Relieve pain (H) a pathogens

Ex Output:
D