This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
[{'content': 'Insulin synthesis is stimulated by glucose levels above \nSelect and explain. \nA. 30 mg%, B. 40 mg%, C. 50 mg%, D. 70 mg%', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Glucose levels >70 mg/dL stimulate insulin synthesis, primarily by enhancing protein translation and processing.Glucose stimulation of insulin secretion begins with its transpo into the beta cell by a facilitative glucose transpoer. Glucose phosphorylation by glucokinase is the rate-limiting step that controls glucose-regulated insulin secretion.Ref: Harrison 19e pg: 2402', 'role': 'assistant'}]