This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
[{'content': 'International disease surveillance includes \nSelect and explain. \nA. Hepatitis, B. Polio, C. TB, D. Leprosy', 'role': 'user'}, {'content': "Answer: B \nExplanation: Diseases under WHO surveillance Polio Rabies Relapsing fever Influenza Salmonella Malaria Louse born typhus Ref : Park's Textbook of Preventive and Social Medicine; 24th edition", 'role': 'assistant'}]