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: Medicine
Which of the following is a case of diabetes mellitus? 
Select and explain. 
A. HbA1C 6-5%, B. Random blood sugar 205 mg% with polyuria, C. Blood sugar 140 mg% after 6 hours of fating, D. Glucose 190 mg% after 2 hours of eating red meat
B: Random blood sugar 205 mg% with polyuria
Answer: B: Random blood sugar 205 mg% with polyuria 
Explanation: Ref - davidsons 23e p 748