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
Recurrent gross hematuria is seen in- 
Select and explain. 
A. Alports's syndrome, B. IgA nephropathy, C. Focal seg. GN, D. DM
B: IgA nephropathy
Answer: B: IgA nephropathy 
Explanation: None