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: fossils are formed when layers of sediment cover the remains of organisms over time, Fact2: Plants and animals are organisms., Question: What forms when plants are covered in layers of sediment over time? (A) Conifers (B) watershred (C) fossils (D) H2O (E) Echinoids (F) bubbles (G) loose soil (H) bones
[A]: C


[Q]: Fact1: lungs are used for breathing air by land animals, Fact2: Elephants are the largest animals on land., Question: What uses lungs for breathing air? (A) rocks (B) some mammals (C) Frogs (D) monotremes (E) humans (F) bacteria (G) elephants (H) oak trees
[A]: G


[Q]: Fact1: Muscles can only contract., Fact2: Muscles in the upper arm called biceps are used to flex the arm., Question: what can only contract? (A) nerves (B) Epidermis (C) the skin (D) strong (E) biceps (F) Bend (G) lungs (H) forces
[A]:
E