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': 'Hardness of water has a beneficial effect against which one of the following- \nSelect and explain. \nA. Renal diseases, B. Metabolic diseases, C. Cerebrovascular diseases, D. Cardiovascular diseases', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is \'d\' i.e., Cardiovascular disease "Hardness of water appears to have a beneficial effect against cardiovascular disease"', 'role': 'assistant'}]