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': 'Rickettsial pox is caused by ? \nSelect and explain. \nA. Rickettsia ricketsiae, B. Rickettsia akari, C. R. Typhi, D. Rickettsia coonri', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Rickettsial pox caused by R.akari Reference; Park&;s Textbook of preventive and social medicine, 24th edition.Pg no. 316', 'role': 'assistant'}]