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: Air pollution harms the respiratory and circulatory systems., Fact2: Cars are a significant source of air pollution., Question: What harms the respiratory and circulatory systems? (A) oil (B) rain (C) sulfur (D) cars (E) tires (F) coal (G) tar (H) bicycles

Ex Output:
D


Ex Input:
Fact1: if soil is permeable then water easily flows through that soil, Fact2: Sandy soils are permeable., Question: Water easily flows through what? (A) streams. (B) streams (C) coral reefs (D) sandy soils (E) aqueous solution (F) swamp vegetation (G) calcite (H) Sediment

Ex Output:
D


Ex Input:
Fact1: Oxygen is just one substance transported by the blood., Fact2: Contraction of a muscle produces heat which is transported to other parts of the body by the blood., Question: What is transported to other parts of the body? (A) Organic compounds (B) ice (C) oxygen and heat (D) vital organs (E) heat energy (F) Veins and arteries. (G) electromagnetic energy (H) cat hair

Ex Output:

C