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: Microbiology
[{'content': 'Which is not transmitted by ahopod ? \nSelect and explain. \nA. Rickettsia prowazakii, B. Coxiella burnetii, C. Rickettsia akari, D. Rickettsia rickettsii', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Coxiella burnetti . The Q fever agent differs from other rickettsiae in many features. - Smaller size - Greater resistance to heat and drying - Major transmission route being inhalation or ingestion. - Independent of ahropod vector. Remember . In milk, Coxiella burnetii may survive pasteurization by the holding method, but the flash method is effective.", 'role': 'assistant'}]