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: Dental
[{'content': 'Mass chemoprophylaxis in endemic area is recommended for all of the following, except: \nSelect and explain. \nA. Yaws, B. Leprosy, C. Trachoma, D. Filaria', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]