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': 'What is the recommended period of isolation for a suspected case of diphtheria? \nSelect and explain. \nA. 7 days, B. 10 days, C. 12 days, D. 14 days', 'role': 'user'}, {'content': 'Answer: D \nExplanation: All suspected or confirmed cases and carriers of diphtheria should be isolated preferably in a hospital for at least 14 days or until proved free of infection by two consecutive nose and throat swabs taken 24 hours apa. Ref: Park 21st edition, page 150.', 'role': 'assistant'}]