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").

Input: Consider Input: Fact1: when a metal rusts , that metal becomes orange on the surface, Fact2: Iron rusts in the presence of oxygen and water., Question: Exposure to oxygen and water can cause iron to  (A) decrease strength (B) melt (C) uncontrollable burning (D) thermal expansion (E) turn orange on the surface (F) vibrate (G) Extremes of temperature (H) levitate

Output: E


Input: Consider Input: Fact1: pollutants have a negative impact on the environment, Fact2: Carbon dioxide is a pollutant., Question: What affects the environment negatively? (A) sunlight (B) normal weather patterns (C) carbon dioxide (D) cigarettes (E) positivity (F) Smoking (G) harmful substances (H) fossil fuels

Output: C


Input: Consider Input: Fact1: a breathing mask is used for keeping harmful particles from entering the respiratory system, Fact2: When inhaled, the particles lodge in the respiratory system, causing or aggravating health problems., Question: a breathing mask keeps what from being inhaled and causing health problems? (A) cigarettes (B) harmful particles (C) chemical changes (D) influenza (E) oxygen particles (F) hydrogen and oxygen (G) air particles (H) atmosphere particles


Output: B