Definition: 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: Fact1: Negative feedback controls insulin secretion by the pancreas., Fact2: Islet cells are located in the pancreas., Question: where are islet cells location? (A) interior chambers (B) more specialized (C) fluid connective tissue (D) antigens that cause allergy (E) where insulin is secreted (F) building blocks of organisms (G) close relatives of coral (H) in the vagina
Output:
E