Question: Male, 68 years old, presented with muscle cramps, hypotension, fasciculations and bronchoconstriction. He has been using organophosphorus pesticides in the garden. He has not used a mask or gloves. What would be the drug of choice for its treatment? 
 Options:  <1> Carbidopa. <2> Acetylcholine <3> Nicotine. <4> Flumazenil <5> Pralidoxime
5