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").

Input: Consider Input: Fact1: extreme heat and pressure change rock into metamorphic rock, Fact2: Marble is a form of metamorphic rock., Question: What is formed from extreme heat and pressure? (A) glass (B) marble (C) crust (D) soils (E) coal (F) sugar (G) calcite (H) arteries

Output: B

Input: Consider Input: 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

Output: G

Input: Consider Input: Fact1: Chordates have a complete digestive system and a closed circulatory system., Fact2: Because reptiles are vertebrates, they are chordates., Question: vertebrates have a complete digestive system and a closed what? (A) digestive tract (B) lung system (C) the body's largest organ (D) circulatory system (E) Veins and arteries. (F) brain stem (G) all liquids (H) major threat to health
Output: D