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: Pediatrics
12 years old Shyam presented with gross hematuria with 80% dysmorphic RBC's 2 days after a attack of upper respiratory tract infection diagnosis is – 
Select and explain. 
A. Microangiopathic thrombotic anaemia, B. IgA Nephropathy, C. PSGN, D. H.S. purpura
B: IgA Nephropathy
Answer: B: IgA Nephropathy 
Explanation: The patient is having glomerulo nephritis (gross hematuria and dysmorphic RBC's) 2 days after upper respiratory tract infection.
Three conditions can manifest like this —> IgA nephropathy, Post streptococcal glomerulonephritis, H.S. Purpura.