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: All cnidarians are aquatic., Fact2: Cnidarians are also called coelenterates., Question: What are aquatic? (A) coelenterates (B) trees (C) lizards (D) angiosperm (E) holding nutrients (F) trees and flowers (G) the Sun (H) humans

Ex Output:
A

Ex Input:
Fact1: Any surface that has not been sterilized is likely to be covered with bacteria., Fact2: Bacteria are single cell microorganism., Question: Any surface that has not been sterilized is likely to be covered with: (A) sticky stuff (B) dead snail shells (C) single cell microorganisms (D) large creatures (E) microbes and mussels (F) nutritious fluid (G) 70-75 degrees Fahrenheit (H) water

Ex Output:
C