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: All life relies on a relatively narrow range of pH, or acidity., Fact2: All organisms have life cycles., Question: what relies on a relatively narrow range of acidity? (A) organisms (B) carbon (C) animals (D) hydrogen (E) density (F) trees (G) Most plants (H) barnacles
Example Output: A

Example Input: Fact1: insulated material can be used for keeping warm, Fact2: An insulated cup with a cover is great for keeping beverages warm., Question: How do you keep a cup hot? (A) less water (B) electricity (C) heat energy (D) adding heat (E) energy usage (F) insulation (G) squeeze (H) energy
Example Output: F

Example Input: Fact1: an automobile engine transforms chemical energy into mechanical energy, Fact2: Mechanical energy is the energy of moving objects., Question: An automobile engine transforms chemical energy into what? (A) driving (B) Greenhouse gases (C) moving objects (D) Something to move (E) meals on wheels (F) bricks on streets (G) vehicles (H) cars on bricks
Example Output:
C