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': 'Which of the following diseases is under international surveillance: March 2010 \nSelect and explain. \nA. Influenza, B. Malaria, C. Polio, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: All of the above', 'role': 'assistant'}]