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
The earliest clinical feature of diabetic nephropathy is: 
Select and explain. 
A. Microalbuminuria, B. Increased serum creatinine, C. Nephritic syndrome, D. Hematuria
A: Microalbuminuria
Answer: A: Microalbuminuria 
Explanation: Answer is A (Microalbuminuria): The first clinically detectable sign of Diabetic Nephropathy is Microalbuminuria.