This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Which of the following statements is true about endemic typhus - \nSelect and explain. \nA. Is caused by R. Rickettsii, B. Is transmitted by the bite of fleas, C. Has no mammalian reservoir, D. Can be cultured in chemically defined culture medium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: <p> Endemic or flea-borne typhus or murine typhus is transmitted by bite of flea. Rats are the reservoir. Causative agent is Rickettsia typhus. Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:300 <\\p>', 'role': 'assistant'}]