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: Pathology
[{'content': 'PTH does not cause - \nSelect and explain. \nA. Maintains serum Ca2+, B. Ca2+ retention, C. Decreased PO43- excretion, D. May cause osteolysis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Effect of parathyroid hormone\nOn calcium\n\nIt increases serum calcium level by\n\n\nIncreases resorption of calcium from bone →\xa0This is the most prominent action.\nStimulates reabsorption of Ca by kidney\nStimulates renal activation of it. D which increases intestinal absorption of calcium\xa0\n\nOn Phosphorus\n\nDecrease the level of PO43-\xa0in Serum by decreasing PO43-\xa0reabsorption in the kidney.', 'role': 'assistant'}]