This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Elimination, Eradication, Surveillance, Subject name: Social & Preventive Medicine
[{'content': 'Mass treatment is used in following diseases except: \nSelect and explain. \nA. Yaws, B. Polio, C. Trachoma, D. Filariasis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: MASS TREATMENT - All people in community are administered with drugs whether they have the disease or not. - The mass treatment is used in control Yaws, Pinta, Bejel, Trachoma & Filariasis. - The existence of at least 4-5 cases of latent infection for each clinical case of active disease in the community is rationale for it. - Patients with a latent (incubating) infection may develop disease at any time. In such cases, mass treatment is a critical factor in the interruption of disease transmission.', 'role': 'assistant'}]