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: a graduated cylinder is used to measure volume of a liquid, Fact2: Volume Volume is a measure of how much space a space figure takes up., Question: What is used to measure how much space a liquid takes up? (A) aerobic capacity (B) a graduated student (C) Water expanding (D) a graduated cylinder (E) body water (F) a scale (G) a granulated cylinder (H) Light passing through water
Example Output: D

Example Input: Fact1: satellites are used to take images from space, Fact2: Satellite images are digital photographs., Question: Satellites are used to take what from space? (A) rapid changes occur (B) snow, ice, and rock (C) trees and flowers (D) painters (E) occurs over a wide range (F) digital photographs (G) digital files (H) photographers
Example Output: F

Example Input: Fact1: Antigens are molecules that the immune system recognizes as foreign to the body., Fact2: Immunology is the study of the immune system., Question: What is one thing studied in immunology? (A) illness (B) antigens (C) humanism (D) health (E) philosophy (F) resistance (G) symbology (H) fever
Example Output:
B