This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical Entomology, Subject name: Social & Preventive Medicine
Which of the following is Chemical stomach poison for mosquito? 
Select and explain. 
A. DDT, B. Malathion, C. Paris green, D. Pyrethrum
C: Paris green
Answer: C: Paris green 
Explanation: Chemical measures for mosquito control:- Stomach poison: Paris green (anti-larval measure). It is copper acetoarsenite. Sodium fluoride is also a stomach poison of mosquito Nerve / contact poison: DDT, Pyrethrum, Malathion (Anti-adult measures). Act by inhibiting acetylcholinesterase enzyme.