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': 'Both OX 2 and OX 19 are seen as positive test in case of: \nSelect and explain. \nA. Scrub typhus, B. RMSF(Rocky mountain spotted fever), C. Epidemic typhus, D. Scrub typhus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: RMSF(Rocky mountain spotted fever)', 'role': 'assistant'}]