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
[{'content': 'Erythropoietin is/are produced by \nSelect and explain. \nA. Juxtaglomerular cells, B. Interstitial cells of the peritubular capillary bed of the kidneys, C. Pars recta of PCT, D. Macula densa', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Interstitial cells of the peritubular capillary bed of the kidneys(Ref. Ganong25th edp.701)Major source of erythropoietin is Interstitial cells of the peritubular capillary bed of the kidneys', 'role': 'assistant'}]