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").

Example Input: Fact1: energy is used for heating a building by a heating system, Fact2: Faculty offices are also in the building., Question: What contains energy to raise the temperture of an office? (A) chemical messengers (B) peachleaf willow (C) deoxyribonucleic acid (D) cooling system (E) swimming pool (F) heating system (G) gym (H) organic molecules
Example Output: F

Example Input: Fact1: shelter is used for protection by animals against weather, Fact2: Many animals use sponges for shelter., Question: What can animals use for protection? (A) hair (B) bushes (C) keratin (D) food (E) shells (F) appendages (G) energy (H) sponges
Example Output: H

Example Input: Fact1: sandpaper is used to smooth wooden objects, Fact2: For the casual look, try using a wooden picnic table., Question: What can be used to smooth tables? (A) backbones (B) keratin (C) sandpaper (D) sand dollar (E) lamphreys (F) wax paper (G) sponges (H) aluminum foil
Example Output:
C