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: Plants use cellulose for their cell walls., Fact2: Basically, fiber is cellulose ., Question: What is made from cell walls? (A) water (B) blood (C) cells (D) sugar (E) a path (F) fiber (G) moss (H) Carbon
Example Output: F

Example Input: Fact1: Biodiversity increases the productivity and stability of ecosystems., Fact2: An ecosystem includes the organisms and their habitat., Question: what does biodiversity increase the productivity and stability of? (A) density (B) the looseness of soil (C) water vapor (D) the environment (E) h2o (F) swamp vegetation (G) biological diversity (H) organisms and their habitat
Example Output: H

Example Input: Fact1: satellites are used to take images from space, Fact2: Satellite imagery gives a global perspective on the ozone hole., Question: What can give a global perspective on the ozone hole? (A) 70-75 degrees Fahrenheit (B) Imagery from space (C) Light shining into it (D) weather vane (E) collision of crustal plates (F) a surface not sterilized (G) sunglasses (H) feedback mechanisms
Example Output:
B