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").

Example Input: Fact1: hydropower requires damming a river, Fact2: Another source of energy is hydropower., Question: What is a source of energy? (A) fossil fuels (B) cooking (C) damming a river (D) sleeping (E) napping (F) Electrical energy (G) our nearest star (H) sunlight
Example Output: C

Example 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
Example Output: E

Example Input: Fact1: the movement of tectonic plates causes volcanic eruptions, Fact2: Large volcanic eruptions can decrease (reduce)the earth's average temperature by (a) emitting particles into the stratosphere, thereby increasing the albedo., Question: What effect could more active plate tectonics have on the earth? (A) rapid expansion (B) Decreased precipitation (C) a tree falling (D) the production of heat (E) Lower average temperature (F) Physical weathering (G) a lot of human deaths (H) Plant growth is reduced
Example Output:
E