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: Medicine
[{'content': 'All of the following are causes of fasting hypoglycemia, except: \nSelect and explain. \nA. Glucagon Excess, B. Glucose-6-Phosphatase deficiency, C. Glycogen-synthase deficiency, D. Uremia', 'role': 'user'}, {'content': "Answer: A \nExplanation: In the above question glucagon excess is the answer because glucagon deficiency leads to fasting hypoglycaemia. Also in glucose - 6 - phosphatase deficiency, hypoglycaemia and lactic acidosis can develop after a sho fast. Glycogen synthase deficiency can also lead to hypoglycaemia and ketosis and Response to insulin and glucose utilization is impaired in patients having uremia. Ref: Harrison's 16th Edition, Page 1658, 2321 (table 341-1), 2180", 'role': 'assistant'}]