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': 'True about scrub typhus is? \nSelect and explain. \nA. Transmitted by larva of trombiculid mite, B. Incubation period is 3-4 days, C. Eschar is diagnostic, D. Caused by Rickettsia typhi', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]