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: Insulin helps cells take up glucose from the blood., Fact2: Insulin produced by the pancreas is endogenous insulin., Question: What does the pancreas help cells take up from the blood? (A) bacteria (B) store (C) Energy. (D) food (E) Energy (F) glucose (G) cells (H) blood
[EX A]: F

[EX Q]: Fact1: a compass is used to navigate oceans, Fact2: And to the east is the Atlantic Ocean., Question: what is a compass used to navigate? (A) density (B) lamphreys (C) marine (D) outer space (E) their speed (F) Antarctica (G) non-magnetic planets (H) the Atlantic
[EX A]: H

[EX Q]: Fact1: matter vibrating can cause sound, Fact2: Sound waves vibrate., Question: what vibrates? (A) nerves (B) motion (C) waves (D) energy (E) dissolve (F) explode (G) shake (H) Energy.
[EX A]:
C