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: a greenhouse is used to protect plants by keeping them warm, Fact2: With lots of rain and a warm climate, plants grow well., Question: What does a greenhouse help plants do? (A) Park cars (B) Start panicking (C) reproduce (D) growth (E) Bloom slower (F) adding heat (G) Regrows it (H) Grow well
[EX A]: H

[EX Q]: Fact1: Mammals have a layer of fat under the skin to help insulate the body., Fact2: Glass insulation keeps beverage warm for hours., Question: What keeps mammals warm? (A) evaporation (B) Animal fur (C) staying warm (D) sweating (E) They have thick fur (F) with their fur (G) a layer of fat (H) Veins and arteries.
[EX A]: G

[EX Q]: Fact1: a light bulb is used for seeing in the dark, Fact2: An electric light bulb is a light source., Question: A what is used for seeing in the dark? (A) darkness source (B) our nearest star (C) light source (D) shade source (E) energy barrier (F) energy (G) photons (H) blackout curtain
[EX A]:
C