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: Precipitation increases moisture., Fact2: Rain is liquid precipitation., Question: what increases moisture? (A) density (B) the sun (C) wind (D) rain (E) Honey (F) 17 (G) droughts (H) Type O
Example Output: D

Example Input: Fact1: burning fossil fuels increases the carbon in the atmosphere, Fact2: Oil is one type of fossil fuel., Question: Burning what substances increases carbon in the atmosphere? (A) CO2 (B) oil (C) tar (D) gas (E) CFCs (F) Cars (G) coal (H) peat
Example Output:
B