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
[{'content': 'Aquaporins are not seen in: \nSelect and explain. \nA. Kidney, B. Lacrimal gland, C. Spleen, D. None of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Aquaporins are integral membrane proteins, expressed in different regions of the body. For example Aquaporin 1 and 2 are seen in the kidney, aquaporin 5 in lacrimal glands, aquaporin 9 in human leukocye, liver lung and spleen. Their main function is to transpo water across cell membranes in response to osmotic gradients. Ref: Ganong's Review of Medical Physiology, 21st Edition, Page 247", 'role': 'assistant'}]