This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Half life of insulin is: 
Select and explain. 
A. 1­-2 min, B. 4-­6 min, C. 0­-12 min, D. 12­-16 min
B: 4-­6 min
Answer: B: 4-­6 min 
Explanation: The half-­life of insulin in the circulation in humans is about 5 min.The half­-life of the insulin receptor is about 7 hours.