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
[{'content': 'Juxtamedullary nephrons constitute what percentage of nephrons \nSelect and explain. \nA. 10, B. 15, C. 30, D. 70', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Juxtamedullary nephrons constitute only 30 percent of total nephrons .....remaining being coical nephrons. Ref: guyton and hall textbook of medical physiology 12 edition page number:460,461,462', 'role': 'assistant'}]