This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Social & Preventive Medicine
[{'content': 'Rickettia prowazaki causes: \nSelect and explain. \nA. Epidemic typhus, B. Endemic typhus, C. Scrub typhus, D. Trench fever', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Epidemic typhus # R.prowazekii named after von Prowazek, who had contracted fatal typhus fever while investigating the disease.> Other diseases caused by Ricketisis are: Endemic typhus - R. typhi (mooseri) Tick typhus - R.rickettsii Scrub/CHIGGER Typhus - Borne -R. tsutsugamushi, R.orientalis Trench/five day fever - R. Quintana (Bartunella quintana)> Epidemic typhus is caused by R. prowazekii.', 'role': 'assistant'}]