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").

Fact1: electricity is used as an energy source by electrical devices, Fact2: Electrical fields result from electrical devices and televisions., Question: What is used as an energy source by television? (A) electricity (B) light (C) our nearest star (D) air (E) energy (F) satellites (G) photons (H) rocks
A

Fact1: water causes refraction of light, Fact2: Halos are produced by the refraction of light., Question: What causes halos? (A) germs (B) Pacific (C) solutes (D) water (E) storms (F) glass (G) algae (H) the sun
D

Fact1: eyes are used for seeing by animals by sensing light, Fact2: Mammals are animals with a backbone., Question: What do mammals use eyes for? (A) to sense sound (B) to touch things (C) focusing a lens (D) it needs them (E) encoded information (F) to sense light (G) to sense smell (H) food and shelter
F