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: Antigens are molecules that the immune system recognizes as foreign to the body., Fact2: Antigens prompt the body to produce antibodies., Question: Antigens are molecules that prompt the what of antibodies? (A) termination (B) failure (C) humans (D) decrease (E) production (F) anemia (G) rapid expansion (H) kinetic

Ex Output:
E


Ex Input:
Fact1: Active immunity results when an immune response to a pathogen produces memory cells., Fact2: Pathogens are germs that cause disease., Question: Active immunity is when an immune response occurs after a germ produces what? (A) harmful substances (B) bioaerosols (C) rapid expansion (D) Allergies (E) anemia (F) it needs them (G) Chemical energy (H) memory cells

Ex Output:
H


Ex Input:
Fact1: adding salt to a solid decreases the freezing point of that solid, Fact2: Solutes decrease the freezing point or the point of crystallization of water., Question: What is one way to lower the freezing point of water? (A) add a solute (B) purify it (C) Solutions (D) remove impurities (E) Calcium carbonate (F) add water (G) evaporation (H) Dehydration

Ex Output:

A