This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'Transovarian transmission is seen in - \nSelect and explain. \nA. Ticks, B. Louse, C. Flea, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Ticks o Transovarian transmission in ahropod vector is seen in scrub typhus (mite), RMSF (tick), indian tick typhus (tick) and rickettsial pox (mite).", 'role': 'assistant'}]