This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': 'All are vectors except - \nSelect and explain. \nA. Ticks, B. Spider, C. Mosquito, D. Fly', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ticks are the vectors of Q fever, relapsing fever, KFD, Tularemia Mosquito are the vectors of malaria, filaria, Japanese encephalitis, dengue, chikungunya Flies are the vectors of typhoid, diarrhoea,dysentery, cholera, gastroenteritis, anthrax, yaws. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 833,834", 'role': 'assistant'}]