This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidneys and Body Fluids, Subject name: Physiology
Collection duct has which cells 
Select and explain. 
A. Principal and intercalated, B. Parietal and oxyntic cells, C. Lacis cells, D. Podocytes
A: Principal and intercalated
Answer: A: Principal and intercalated 
Explanation: Ans. (a) Principal and intercalated(Ref: Ganong, 25th ed/p.672)Colleting duct is made up of two types of cell: principal cells (P cells) and intercalated cells (I cells)