<prompt> All of the following are causes of fasting hypoglycemia, except:Glucagon ExcessGlucose-6-Phosphatase deficiencyGlycogen-synthase deficiencyUremia  <response>: 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: Harrisons 16th Edition, Page 1658, 2321 table 341-1, 2180 