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: safety goggles are used for protecting the eyes during experiments, Fact2: Larger pupil and larger corneas permit more light to enter the eye., Question: What are used for protecting the pupils during experiments? (A) specialized (B) safety gloves (C) safety goggles (D) safe operation (E) lamphreys (F) Chemicals (G) chemical messengers (H) safety suit
Example Output: C

Example Input: Fact1: breaking apart rocks can cause debris, Fact2: Examples of such rock include sandstone and shale ., Question: What can cause debris? (A) breaking apart sandstone (B) some invertebrates (C) breaking apart air (D) remains of prehistoric life (E) exposure to cold (F) breaking apart clouds (G) breaking apart water (H) forest is destroyed
Example Output: A

Example Input: Fact1: a light bulb requires electrical energy to produce light, Fact2: Energy is used by power plants to make electricity., Question: What is required for a light bulb to produce light? (A) garden (B) sunlight (C) concrete (D) an electron lens (E) Power plant (F) adding heat (G) Potted plant (H) sun's heat
Example Output:
E