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': 'Yellow fever is caused by - \nSelect and explain. \nA. Arbovirus, B. Alpha virus, C. Sindbis, D. Chikungunaya virus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: <p> YELLOW FEVER:- Zoonoses disease caused by arbovirus. Affects principally monkeys and other veebrates and is transmitted to humans by culicine mosquitoes. Reservoir- mokeys and forest mosquitoes., in urban areas reservoir is man besides Aedes aegypti. A temperature of 24 deg celcius or more required for its multiplication. Period of communicability- Blood of patients infective upto first 3-4 days {Reference: park&;s textbook of preventive and social medicine, 23rd edition, pg no.282}</p>', 'role': 'assistant'}]