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
True regarding glucose tolerance test are all except: September 2007 
Select and explain. 
A. Can be done in fasting as well as post prandial state, B. 1 gram of glucose/kg body weight is administered, C. Glucose levels are checked after 2 hours, D. Diagnosis of diabets mellitus can be established
A: Can be done in fasting as well as post prandial state
Answer: A: Can be done in fasting as well as post prandial state 
Explanation: Ans. A: Can be done in fasting as well as post prandial stateOral GTT is done in fasting state.Blood glucose values return back to below normal in non diabetics in about 2 hours whereas blood glucose in diabetics rises too much and levels fall back to control only after 4-6 hours.