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: 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: Antigens are molecules that the immune system recognizes as foreign to the body., Fact2: Children are born with an immature immune, or defense, system., Question: What are molecules that the defense system recognizes as foreign to the body? (A) Allergies (B) lungs (C) antigens (D) bacteria (E) parasites (F) atoms (G) red blood cells (H) acetic acid
Example Output: C

Example Input: Fact1: biofuel is used to produce electricity by burning, Fact2: Any green plant can be considered for use in the production of biofuel or bioenergy., Question: What can a plant be used to produce when it's burned? (A) toxins (B) energy (C) sun's heat (D) carbon dioxide (E) kinetic energy (F) heat energy (G) adding heat (H) Electricity
Example Output:
H