This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
Diabetes mellitus is best diagnosed by 
Select and explain. 
A. Fasting blood sugar > 100mg/dl and post prandial blood sugar > 140mg/dl, B. Fasting blood sugar > 126mg/dl and post prandial blood sugar > 199mg/dl, C. HbA1C = 5.5%, D. Fasting blood sugar > 70mg/dl
B: Fasting blood sugar > 126mg/dl and post prandial blood sugar > 199mg/dl
Answer: B: Fasting blood sugar > 126mg/dl and post prandial blood sugar > 199mg/dl 
Explanation: The WHO recommendations for the diagnostic criteria for diabetes:Fasting plasma glucose: >/= 126mg/dlor2-hour plasma glucose: > 200mg/dlRef: Park; 23rd ed; Pg 395