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: a refrigerator is used for keeping food fresh for a long period of time, Fact2: Refrigerators are major users of electricity., Question: What requires a lot of electricity? (A) riding a bicycle (B) An emergency lighting source. (C) repair cells in the human body (D) sleeping on the floor (E) visiting a dam (F) Something that take eight minutes to travel to the Earth (G) Heating a metal filament. (H) keeping food fresh for long periods of time
H

Fact1: a prism is used for refracting light, Fact2: Refraction is the bending of light cause by a speed change when it passes through different media., Question: What aspect of light changes when it passes from air into a prism? (A) power (B) seasons (C) speed (D) energy (E) a wave (F) Joules (G) heat (H) unique
C

Fact1: when a metal rusts , that metal becomes orange on the surface, Fact2: Chemically, iron is an active metal., Question: When iron rusts, it becomes what on the surface? (A) osculum (B) a metal (C) black (D) pink (E) Elemental (F) invisible (G) hued (H) orange

H