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").

Ex Input:
Fact1: Bile reduces the acidity of food entering from the highly acidic stomach., Fact2: Bile, a fluid made by the liver, is stored in the gallbladder., Question: Fluid that reduces the acidity of food is stored in (A) the throat (B) Microscopic vessels. (C) the rectum (D) the gallbladder (E) chondrocytes (F) the small intestine (G) holding nutrients (H) intestinal

Ex Output:
D

Ex Input:
Fact1: a light bulb is used for seeing in the dark, Fact2: Conventional light bulbs generate light by heating a filament., Question: What is helpful for seeing in the dark? (A) an electron microscope (B) an electron lens (C) microscope (D) closing the blinds (E) blackouts (F) closing your eyes (G) focusing a lens (H) heating a filament

Ex Output:
H

Ex Input:
Fact1: coal is used to produce electricity by burning in coal-fire power stations, Fact2: Swamp vegetation was compressed to form coal., Question: what is used to produce electricity by burning in power stations? (A) dried mud (B) small animals (C) heat energy (D) chemical reaction (E) carbon dioxide (F) swamp air (G) hydrogen and oxygen (H) swamp vegetation

Ex Output:
H