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': 'About rickettsiae, all are true except - \nSelect and explain. \nA. These are transmitted by ahropod vectors, B. Eschar is not seen in RMSF, C. Weil-Felix reaction may be diagnostic, D. Cephalosporins are drugs of choice', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Cephalosporins are drugs of choice . Tetracyclines (e.g., doxycycline are DOCs).", 'role': 'assistant'}]