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': 'Transovarian transmission is a feature of - \nSelect and explain. \nA. Scrub typhus, B. Epidemic typhus, C. Endemic typhus, D. Trench fever', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In scrub typhus, the infection is maintained in nature transovarially from one generation of mite to the next. Ref: PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition pg 300', 'role': 'assistant'}]