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: 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: sugar causes food to taste sweet, Fact2: Favorite foods are cakes, noodles, rice, eggs and fruits., Question: What tastes sweet due to sugar? (A) diet soda (B) corn (C) ice (D) water (E) apple (F) coffee (G) cake (H) sugar
Example Output: G

Example Input: Fact1: Viruses are so small that they can be seen only with an electron microscope., Fact2: On the surface of each microscopic color filter is also a microscopic lens., Question: Viruses are so small that to see them a scientist would have to use what kind of lens? (A) Refract it (B) refraction of light (C) an electron lens (D) an image (E) rays or beams (F) bending light rays (G) A computer (H) flashlights
Example Output:
C