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': 'True about anopheles mosquito- \nSelect and explain. \nA. Larvae have siphon tube, B. Larvae are surface feeder, C. Larvae are bottom feeder, D. Larvae tie at an angle to water surface', 'role': 'user'}, {'content': "Answer: B \nExplanation: Anopheles mosquito: Eggs are laid singly, boat-shaped with lateral floaters Larvae rest parallel to the surface and are thus surface feeders, have no siphon tube, palmate hairs are present Adults at rest are inclined at an angle to the surface, wings are spotted, palpi are long in both sexes. Only option 2 is correct. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 831.", 'role': 'assistant'}]