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 Q]: Fact1: wiring requires an electrical conductor, Fact2: Wires connected to a source of electricity., Question: An electrical conductor is required for the operation of: (A) water current (B) electricity (C) satellites (D) energy (E) to move people (F) gas lamps (G) trains (H) lightning
[EX A]: B

[EX Q]: Fact1: keeping food cold is used for keeping food fresh, Fact2: A refrigerator that keeps food cold., Question: What is a refrigerator used for? (A) Electrical energy (B) A place to hang magnets (C) Cooling your home (D) staying warm (E) A doorstop (F) electricity (G) energy usage (H) Keeping food fresh
[EX A]: H

[EX Q]: Fact1: Oxygen is essential for cellular respiration for all aerobic organisms., Fact2: Besides nitrogen and oxygen, the atmosphere contains many, many other molecules in trace amounts., Question: What is essential for cellular respiration? (A) Veins and arteries. (B) kinetic energy (C) The atmosphere (D) Energy. (E) heat energy (F) Organic compounds (G) Chemical energy (H) flow of electrons
[EX A]:
C