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 of infection occurs in - \nSelect and explain. \nA. Fleas, B. Ticks, C. Mosquitoes, D. Sandfly', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ticks transmit disease by biting (larva and nymph also by biting) - Trans-stadially Experiments in ticks have shown trans-ovarian transmission of infection through successive generations. REF: PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE, 25TH EDITION, PG NO. 840", 'role': 'assistant'}]