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
Young adult normotensive patient with painless gross hematuria, most likely diagnosis - 
Select and explain. 
A. Minimal change disease, B. IgA nephropathy, C. Cresentic GN, D. Membrano proliferative
B: IgA nephropathy
Answer: B: IgA nephropathy 
Explanation: None