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").

[Q]: Fact1: Mammals have a layer of fat under the skin to help insulate the body., Fact2: Harbor seals, like sea lions, have evolved to utilize a layer of fat called blubber., Question: How do sea lions keep warm? (A) protected (B) warm (C) Swimming fast (D) Sleeping (E) hydration (F) Blubber (G) four limbs (H) Eating a lot of fish
[A]: F

[Q]: Fact1: Heterotrophs are living things that cannot make their own food., Fact2: All animals are heterotrophs., Question: what are living things that cannot make their own food? (A) hydrogen (B) clouds (C) animals (D) humans (E) bacteria (F) bushes (G) fungi (H) plants
[A]: C

[Q]: Fact1: Carbon may be stored in sedimentary rock for millions of years., Fact2: Limestone is a rock composed of calcium, carbon and oxygen., Question: what is in limestone? (A) abrasion (B) fossils (C) an anion (D) acid (E) nitrogen (F) gypsum (G) carbon (H) NaCl
[A]:
G