The following are small residual insecticides EXCEPT -: (A) Pyrethrum, (B) DDT, (C) Gamma BHC, (D) Malathion
Answer is A. Anti-adult measures: Residual sprays (DDT, Lindane, Malathion, OMS-33) Space sprays (Pyrethrum extract, residual space insecticide - Malathion and fenitrothion fogging) Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 833