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
A six year old male baby presents to a hospital with recurrent gross hematuria for 2 years. There is no hio burning micturition or pyuria. Urine routine examination demonstrated no pus cells and urine culture was sterile. Serum C3 levels were normal. What is the most probable diagnosis 
Select and explain. 
A. Wilm's tumour, B. IgA nephropathy, C. Post -streptococcal glomerulonephritis, D. Urinary tract infection
B: IgA nephropathy
Answer: B: IgA nephropathy 
Explanation: Answer is B (IgA Nephropathy) Recurrent Gross hematuria is a charachteristic feature of IgA Nephropathy A diagnosis of IgA Nephropathy is fuher suppoed by the presence of normal complement C3 levels.