This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal physiology, Subject name: Physiology
Acidification of urine occur in? 
Select and explain. 
A. Collecting ducts, B. PCT, C. Ascending limb of loop of henle, D. Descending limb of loop of henle
B: PCT
Answer: B: PCT 
Explanation: Acidification of urine occur in PCTRef: Ganong&;s review of medical physiology; 24th edition; page no; 712