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: Carbon cycles quickly between organisms and the atmosphere., Fact2: Water, carbon dioxide, and nitrogen are all needed by living things., Question: What is needed by living things? (A) hate (B) sunlight (C) Chemical energy (D) pain (E) love (F) hydration (G) The atmosphere (H) Energy.
[EX A]: G

[EX Q]: Fact1: satellites are used to take images from space, Fact2: Images of Earth taken from space., Question: Images of Earth are taken by (A) satellites (B) light (C) Communication (D) millions (E) radar (F) Plate tectonics (G) moving plates (H) lamphreys
[EX A]: A

[EX Q]: Fact1: the vanes rotating in an electric fan causes air to move, Fact2: Output of the fan is varied by means of a series of adjustable vanes upstream of the impeller., Question: what is fan speed? (A) energy barrier (B) kinetic energy (C) fixed (D) cycles (E) Winter (F) static (G) solid (H) adjustable
[EX A]:
H