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: a flashlight requires a source of electricity to produce light, Fact2: Lanterns and flashlights are sources of light used for camping., Question: What does a lantern use a source of electricity for? (A) heat energy (B) staying warm (C) enclose light (D) produce light (E) absorb heat (F) reflect light (G) to move people (H) protect them

Ex Output:
D


Ex Input:
Fact1: irradiating food can be used to kill existing microorganisms in the food, Fact2: Irradiation causes chemical changes., Question: what can be used to kill existing microorganisms in food? (A) chemical changes (B) Dehydration (C) deoxyribonucleic acid (D) bacteria (E) an electron microscope (F) hydration (G) electromagnetic energy (H) single-celled organisms

Ex Output:

A