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: Male dogs use pheromones in urine to mark their territory., Fact2: Pheromones are natural aphrodisiacs., Question: What do male dogs use in urine to mark their territory? (A) Natural aphrodisiacs (B) competing for resources (C) Tails (D) Urine  cleaner (E) Something coming from a gland (F) Chemical energy (G) an area swollen with pus (H) Chew toys
Example Output: A

Example Input: Fact1: Pneumonia may be caused by an infection or injury of the lungs., Fact2: Lung injuries are treated with bronchodilatory treatment., Question: What treatment can be used in treating pneumonia? (A) the respiratory system (B) a breathing mask (C) bronchodilatory treatment (D) aqueous solution (E) immunotherapy (F) radiation therapy (G) immune system (H) chemotherapy
Example Output: C

Example Input: Fact1: some animals' fur grows thicker for staying warm in the winter, Fact2: Mammals have hair and fur., Question: Why do some animals have hair that grows longer during the winter? (A) It expands (B) to make braids (C) to wear a scarf (D) to attract mates (E) When it's cold (F) to stay warm (G) It remains dormant (H) genetic diversity
Example Output:
F