This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nephrology, Subject name: Medicine
[{'content': 'Which of the following statement on microalbuminuria is not true? \nSelect and explain. \nA. Cannot be detected by routine lab tests, B. Urine protein less than 30-299 pg/day is called microalbuminuria, C. Microalbuminuria is an independent risk factor for cardiovascular risk in diabetic patients, D. Microalbuminuria is the earliest marker of diabetic nephropathy.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The significance of microalbuminuria: Microalbuminuria is the finding of albumin in the urine not detectable by the urine dipstick which is sensitive to protein concentration > 1gm%. It precedes the decline in GFR and indicates the presence of renal and cardiovascular complications. Annual screening for microalbuminuria will allow the identification of patients with nephropathy at a point very early in its course. Definition of abnormalities in albumin excretion Category 24-hr-urine albumin (mg/24h) Dipstick analysis Spot collection (ug/mg creatinine) Normal Microalbuminuria Clinical albuminuria <30 30-299 >300 Negative Negative, trace, 1+ 1+ to 3+ <30 30-299 >300', 'role': 'assistant'}]