This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': '17D vaccine is used for the prevention and control of - \nSelect and explain. \nA. Yellow fever, B. Japanese encephalitis, C. Hemorrhagic fever, D. Dengue', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 17 D vaccine is used for the prevcntio and control of urban yellow fever.It is a live atteunated vaccine prepared from a non virulent strain, which is grown in chick embryo and subsequently freeze dried Reference; Park&;s Textbook of preventive and social medicine, 24th edition.Pg no. 300', 'role': 'assistant'}]