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': 'Which cells in the kidney produce 1,25 dihydroxy - cholecalciferol? \nSelect and explain. \nA. Granular cells, B. Proximal convoluted tubule cells, C. Mesangial cells, D. Peritubular cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B Proximal convoluted tubular cellsRef: Contemporary Nephrology, 1st ed. pg. 164 and Indu KhuranaGranular cellsProduce reninProximal convoluted cellsContain 1 alpha hydroxylase that is essential to produce vitamin D3 Mesangial cellsRegulate RBC leakagePeritubular cellsProduce erythropoietin', 'role': 'assistant'}]