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': 'The main vector of Dengue fever is - \nSelect and explain. \nA. Aedes aegypti, B. Aedes albopictus, C. Aedes polynesiensis, D. Aedes scutellaris', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]