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
True about anopheles mosquito ? 
Select and explain. 
A. Larvae have siphon tube, B. Larvae are surface feeder, C. Larvae are bottom feeder, D. Larvae tie at an angle to water surface
B: Larvae are surface feeder
Answer: B: Larvae are surface feeder 
Explanation: Ans. is 'b' i.e., Larvae are surface feeder