Teacher:You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
Teacher: Now, understand the problem? Solve this instance: The primary function of insulin in our bodies is to
(A) store fuel for later use. (B) regulate the amount of glucose in the blood. (C) increase the efficiency of fuel consumption. (D) prevent digestive bacteria from consuming glucose.
Student:
B