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': 'Which one of the following ricketsial diseases is transmmited by mite - \nSelect and explain. \nA. Murine typhus, B. Rockey mountain spotted fever, C. Q- fever, D. Endemic typhus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]