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: Ribosomes are sites where proteins are made., Fact2: E ndoplasmic reticulum are membranes attached to ribosomes., Question: What are membranes attached to sites where proteins are made? (A) the body's largest organ (B) Veins and arteries. (C) epidermis and dermis (D) layers of fat (E) cell walls (F) cell membranes (G) endoplasmic reticulum (H) brain cells
Output:
G