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: a breathing mask is used for keeping harmful particles from entering the respiratory system, Fact2: Pulmonologists treat lungs and respiratory systems., Question: what does a breathing mask keep harmful particles from entering? (A) skin (B) tissue (C) stomach (D) h2o (E) H20 (F) air (G) lungs (H) gas masks
[A]: G

[Q]: Fact1: plasma is formed by electrons separating from atoms in stars, Fact2: Plasma exists inside stars and in interstellar gases., Question: What is formed by electrons separating from interstellar gases? (A) an object (B) Energy. (C) proteins (D) led lights (E) air (F) light (G) plasma (H) dust
[A]: G

[Q]: Fact1: pathogens can cause disease, Fact2: Measles is a disease caused by the measles virus., Question: What is an example of something that pathogens cause? (A) influenza (B) Measles (C) bacteria (D) smallpox (E) Broken leg (F) viruses (G) Concussion (H) Forgetfulness
[A]:
B