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: Physiology
1st response to hypoglycemia 
Select and explain. 
A. Increased insulin, B. Increased glucagon, C. Increased coisol, D. Increased nor epinephrine
B: Increased glucagon
Answer: B: Increased glucagon 
Explanation: Hypoglycemia is defined as the condition of low blood sugar. Hypoglycemia occurs when blood sugar (or blood glucose) concentrations fall below a level necessary to properly suppo the body&;s need for energy and stability throughout its cells.Carbohydrates are the main dietary source of the glucose that is manufactured in the liver and absorbed into the bloodstream to fuel the body&;s cells and organs. Glucose concentration is controlled by hormones, primarily insulin and glucagon. Glucose concentration also is controlled by epinephrine (adrenaline) and norepinephrine, as well as growth hormone. If these regulators are not working properly, levels of blood sugar can become either excessive (as in hyperglycemia) or inadequate (as in hypoglycemia).Ref: Ganong&;s review of medical physiology;24th edition; page no-448