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 and permanent hardness of water is removed by- \nSelect and explain. \nA. Boiling, B. Addition of lime, C. Permutit method, D. All', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Permutit method", 'role': 'assistant'}]