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
Insulin synthesis is stimulated by glucose levels above 
Select and explain. 
A. 30 mg%, B. 40 mg%, C. 50 mg%, D. 70 mg%
D: 70 mg%
Answer: D: 70 mg% 
Explanation: 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