This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Haemophilus, Yersinia, Spirochaetes, Ricketssia, Chlamydia, Mycoplasma and Miscellaneous Bacteria), Subject name: Microbiology
[{'content': 'Trans ovarian transmission is seen among: \nSelect and explain. \nA. Rickettsia akari, B. Rickettsia rickettsii, C. Rickettsia prowazekii, D. Rickettsia typhi', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Transovarial or transovarian transmission- transmit pathogens from parent ahropod to offspring ahropod. Rickettsia rickettsii, carried within ticks, is passed on from parent to offspring tick by transovarial transmission Occurs also in aedes mosquito vector of the yellow fever virus and in phlebotomine sandflies that transmit pappataci fever Rickettsia prowazekii kills the vector that carries it (human louse).', 'role': 'assistant'}]