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: Mutualism is a symbiotic relationship in which both species benefit., Fact2: Dogs and humans are symbiotic species., Question: what exists between dogs and humans? (A) mutualism (B) gravity (C) communication (D) antigens (E) several genes (F) space between (G) electrons (H) german shepherd
Example Output: A

Example Input: Fact1: Most amphibians breathe with gills as larvae and with lungs as adults., Fact2: All frogs are amphibians., Question: What do frogs breathe with when they are adults? (A) skin (B) fins (C) lungs (D) oxygen (E) gills (F) air (G) Energy (H) Gases
Example Output: C

Example Input: Fact1: Organs of excretion make up the excretory system., Fact2: Urinary system Excretory system removes waste and toxic substances from blood., Question: What is the purpose of organs of excretion? (A) Removing waste from blood (B) Producing offspring (C) storing water (D) water conservation (E) it protects them (F) destroying bacteria (G) Circulating blood (H) Producing hormones
Example Output:
A