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: Active immunity results when an immune response to a pathogen produces memory cells., Fact2: Vaccination is Active Acquired Immunity., Question: What results when an immune response to a pathogen produces memory cells? (A) anemia (B) vaccination (C) kill them (D) competition (E) lie detectors (F) rapid expansion (G) killing insects (H) it needs them

Output: B


Input: Consider Input: Fact1: Nonmetal elements are far fewer in number., Fact2: Each element is either a metal, nonmetal, or metalloid., Question: elements that are not metal or metalloid are far what in number? (A) DNA (B) Type O (C) Mohs (D) fewer (E) eight (F) Unsafe (G) 86400 (H) distal

Output: D


Input: Consider Input: Fact1: drought is when amount of precipitation decreases, Fact2: Most of the precipitation falls as snow., Question: What does lack of snow cause? (A) erosion (B) cold (C) drought (D) flooding (E) cracking (F) freezing (G) friction (H) tundra


Output: C