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: Surgery
A pt. presents with hematuria of several days and dysmorphic RBC casts in urine. The site of origin is ? 
Select and explain. 
A. Kidney, B. Ureter, C. Bladder, D. Urethra
A: Kidney
Answer: A: Kidney 
Explanation: Ans. is 'a' ie kidney "Isolated microscopic haematuria can be a manifestation of glomerular disease. The RBCs of glomerular origin are often dysmorphic." "Haematuria with dysmorphic RBCs, RBC casts and protein excretion > 500 mg/day is viually diagnostic of glomerulonephritis." - Harrison