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: Urine is the liquid waste product of the body that is excreted by the urinary system., Fact2: Mammals excrete urea in the watery form of urine ., Question: What is a waste product of the body that is excreted by the urinary system? (A) potash (B) food (C) CO 2 (D) sugar (E) urea (F) liquid (G) H 2 O (H) sulfur
Example Output: E

Example Input: Fact1: Male dogs use pheromones in urine to mark their territory., Fact2: During Urination Dog's urine is used as a scent marker for other dogs., Question: How do male dogs mark their territory? (A) Chemical energy (B) Hot dog eating contest (C) Adequate signage (D) with their fur (E) Scent marker (F) heat produced (G) mate with females (H) Paint
Example Output: E

Example Input: Fact1: Thyroid hormones increase the rate of metabolism in cells throughout the body., Fact2: Thyroxine, a thyroid hormone, is an aryl iodide., Question: Thyroxine increases the rate of metabolism in cells throughout the what? (A) Summer (B) body (C) state (D) skin (E) H 2 O (F) HIV (G) life (H) humans
Example Output:
B