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
Which of the following is not a Synthetic Pyrethyroid Compound? 
Select and explain. 
A. DDT, B. Permethrin, C. Propahrin, D. Cypermethrin
A: DDT
Answer: A: DDT 
Explanation: DDT is not a synthetic Pyrethroid compound while the other three (Propahrin, Cypermethrin and Permthrin) are synthetic pyrethroid compounds Ref: Goldfrank's Toxicological Emergencies, 8th Edition, Page 1529; Park's Textbook of Preventive and Social Medicine, 19th Edition, Pages 637-639.