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
Presence of which of the following in the urine is diagnostic of glomerular injury: 
Select and explain. 
A. 20% dysmoiphic RBC’s, B. Bright red cells, C. 100RBC per high power eld, D. Beta2 micro globulin
A: 20% dysmoiphic RBC’s
Answer: A: 20% dysmoiphic RBC’s 
Explanation: “The RBC ’s of Glomerular origin are often Dysmorphic when examined by Phase contrast microscopy”
“Hematuria with Dysmorphic RBC’s cast and protein excretion >500 mg /d is virtually diagnostic of Glomerulonephritis”.