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': 'All are true about Yellow Fever except \nSelect and explain. \nA. Incubation period is 3-6 days, B. Validity of Int’l certificate of Vaccination lasts up to 10 years, C. Urban form is controlled by 17 D vaccine, D. Aedes aegypti index should not be more than 10% to ensure freedom from yellow Fever', 'role': 'user'}, {'content': 'Answer: D \nExplanation: • Incubation Period: 3 – 6 days\n• Yellow Fever Vaccine:\nLive attenuated, lyophilized (Freeze dried) vaccine\nStrain: 17D strain (Chick Embryo grown)\nReconstitution with Diluent: Cold physiological saline\nImmunity lasts: From 7 days of Vaccination till 35 years\nWHO recommended validity of Vaccination Certificate for International travel: from 10 days to 10 years\nYF vaccine is the only Live vaccine that can be administered in Pregnancy (if there is risk of exposure)', 'role': 'assistant'}]