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: Physiology
The coical pa of collecting duct is functionally similar to which pa of kidney? 
Select and explain. 
A. DCT, B. Thin ascending pa of Henle loop., C. Thick ascending pa of Henle loop., D. Medullary pa collecting duct.
A: DCT
Answer: A: DCT 
Explanation: DCT.Collecting ducts has mainly 2 poions:Coical poion of collecting duct.Medullary poion/Medullary Collecting Duct (MCD).PROCESS IN COICAL COLLECTING DUCT:Functionally similar to late segment of distal tubule.Facultative absorption type:Reabsorption of solutes/water depends on body water/electrolyte balance.Hence, facultative type.Cells involved in reabsopion:Principal (P) cells.Intercalated (I) cells.