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").

Q: 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

A: C
****
Q: Fact1: Pneumonia may be caused by an infection or injury of the lungs., Fact2: Lung injuries are treated with bronchodilatory treatment., Question: What treatment can be used in treating pneumonia? (A) the respiratory system (B) a breathing mask (C) bronchodilatory treatment (D) aqueous solution (E) immunotherapy (F) radiation therapy (G) immune system (H) chemotherapy

A: C
****
Q: Fact1: killing microorganisms in food can be used to extend the shelf life of that food, Fact2: Irradiation kills microorganisms that spoil food., Question: What can be used to extend the shelf life of food? (A) irradiation (B) farming (C) Dehydration (D) rays or beams (E) vegetables (F) Cooking (G) Enzymes (H) fruit

A:
A
****