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: hydropower requires damming a river, Fact2: Another source of energy is hydropower., Question: What is a source of energy? (A) fossil fuels (B) cooking (C) damming a river (D) sleeping (E) napping (F) Electrical energy (G) our nearest star (H) sunlight

Ex Output:
C

Ex Input:
Fact1: Amphibians have permeable skin that easily absorbs substances from the environment., Fact2: All frogs are amphibians., Question: What has permeable skin? (A) goats (B) alligators (C) animals (D) apples (E) frogs (F) sharks (G) humans (H) snakes

Ex Output:
E

Ex Input:
Fact1: Ozone depletion results in higher levels of UV radiation reaching Earth., Fact2: Ozone Ozone is a natural component of the atmosphere., Question: What results in higher levels of UV radiation reaching Earth? (A) atmospheric enhancement (B) deadly and devastating (C) a tree falling (D) global warming (E) movement of tectonic plates (F) atmospheric restoration (G) atmospheric gain (H) atmospheric depletion

Ex Output:
H