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
Potassium is maximally absorbed in which pa of nephron? 
Select and explain. 
A. PCT, B. DCT, C. Collecting ducts, D. Loop of Henle
A: PCT
Answer: A: PCT 
Explanation: Much of the filtered K+ is removed from the tubular fluid by active reabsorption in the proximal tubules K+ is then secreted into the fluid by the distal tubular cells. In the absence of complicating factors, the amount secreted is approximately equal to the K+ intake, and K+ balance is maintained. Ref: Ganong 25th ed/page 681