This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
Transcytosis occurs in 
Select and explain. 
A. M cells of intestine, B. Neuroglia, C. Pneumocytes, D. Axonlemma
A: M cells of intestine
Answer: A: M cells of intestine 
Explanation: In transcytosis, vesicles undergo Endocytosis on one side of a cell and then undergo exocytosis on the opposite side of the cell. Transcytosis is mostly seen in capillaries but also seen in M cells of intestine, osteoclasts,neurons (Ref: Ganong's Review of medical physiology)