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: Pathology
Microalbuminuria is defined as protein levels of 
Select and explain. 
A. 30-300 mg/d, B. 151-200 mg/d, C. 100-150 mg/d, D. 301-600 mg/d
A: 30-300 mg/d
Answer: A: 30-300 mg/d 
Explanation: • The earliest manifestation of diabetic nephropathy is the appearance of low amounts of albumin in the urine (>30 mg/day, but <300 mg/day), that is, microalbuminuria.
• Microalbuminuria is also a marker for greatly increased cardiovascular morbidity and mortality for persons with either type 1 or type 2 diabetes