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 caused by Rickettsia? \nSelect and explain. \nA. Weil's disease, B. Rocky mountain spotted fever, C. Scrub typhus, D. Lymes disease", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Rocky mountain spotted fever Family rickettsiae includes six genera: - Rickettsia - Ehrlichia - Orientia - Anaplasma - Neorickettisa - Coxiella', 'role': 'assistant'}]