<prompt> Gastric lavage is contraindicated in Rx of poisoning due to the following EXCEPT:Nitric acidH2SO4HCLCarbolic acid  <response>: Ans. d Carbolic acid. Ref. Parikh, FMT, 5th ed., 130 and Reddy, FMT, 13th ed., 367CONTRAINDICATIONS TO GASTRIC LAVAGE Corrosive poisoning danger of perforation. Convulsant poisons Comatose patients Volatile poisons Upper alimentary disease e.g. varices Marked hypothermia 