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': 'Blanket/ mass treatment is indicated in all EXCEPT: September 2004 \nSelect and explain. \nA. Trachoma, B. Malaria, C. Yaws, D. Dengue fever', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. Dengue fever', 'role': 'assistant'}]