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: seeing requires light, Fact2: Vision is our ability to see., Question: What is required for vision? (A) light (B) goggles (C) food (D) smell (E) hormones (F) Protein (G) color (H) hue
[EX A]: 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: a meter stick is used to measure distance, Fact2: Depths and distances are represented in meters., Question: What measures a meter? (A) meter stick (B) football field (C) tetraceratops (D) visibility (E) weater (F) U.S. customary units (G) horses (H) lamphreys
[EX A]:
A