This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': 'Transovarian transmission is seen in which infection - \nSelect and explain. \nA. Plague, B. Filarial, C. Guinea, D. Rocky Mountain spotted fever', 'role': 'user'}, {'content': "Answer: D \nExplanation: Transovarial transmission is done by Ticks. Tick born disease above is RMSF caused by Rickettsia rickettsii REF: PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE, 25TH EDITION, PG NO. 840", 'role': 'assistant'}]