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: Social & Preventive Medicine
[{'content': 'Temporary hardness of water is primarily due to the presence of \nSelect and explain. \nA. Calcium and magnesium sulphates, B. Calcium and magnesium chlorides, C. Calcium and magnesium bicarbonates, D. Calcium and magnesium nitrates', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Temporary hardness (Carbonate hardness) due to Calcium & Magnesium salts of Bicarbonates.', 'role': 'assistant'}]