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': 'It is true regarding endemic typhus that ? \nSelect and explain. \nA. Man is the only reservoir of infection, B. Flea is a vector for the disease, C. The rash developing into eschar is a characteristic presentation, D. Culture of the etiological agent in tissue culture is a diagnositc', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Flea is a vector for the disease . Endemic typhus is transmitted by the rat flea. . Rats are the major reservoir . There is no eschar in endemic typhus Diagnosis is made by serological test (IFA) or PCR amplification of R typhi DNA from blood -", 'role': 'assistant'}]