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': 'Rickettsia tsutsugamushi is a small gram-negative, obligate intracellular organism causing \nSelect and explain. \nA. Epidemic typhus, B. Endemic typhus, C. Scrub typhus, D. Q fever', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Scrub typhus', 'role': 'assistant'}]