This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
Normal capacity of renal pelvis is 
Select and explain. 
A. 7 ml, B. 12 ml, C. 15 ml, D. 20 ml
A: 7 ml
Answer: A: 7 ml 
Explanation: The renal pelvis is roughly pyramidal, with the base facing the parenchyma and the apex funneling down into the ureter. It usually has a capacity of 3 to 10 mL of urine. ref : campbell - walsh urology 11th ed , chapter 42 , pg no : 973