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
All of the following are larva control measures except - 
Select and explain. 
A. Gambusia, B. Intermittent irrigation, C. DDT, D. Paris green
C: DDT
Answer: C: DDT 
Explanation: Antilarval measures of mosquito control are: Environmental control - Source reduction and minor engineering methods like filling, levelling and drainage of breeding places and water management(like intermittent irrigation) Chemical control -Mineral oils, Paris green, synthetic insecticides Biological control with gambusia and lebister which feed on larvae of mosquitos. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 832