This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Internationally quarantinable disease are \nSelect and explain. \nA. Plague, B. Cholera, C. Yellow fever, D. All of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: At the international level the WHO maintains surveillance of impoant diseases -eg influenza, malaria, polio and gives timely warning to all national governments. Surveillance if properly pursued can provide the health agencies with an overall intelligence and disease accounting capability. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 138", 'role': 'assistant'}]