<prompt> Gastric lavage is contraindicated in which of the following poisoning?OrganophosphorousDhaturaKeroseneCopper sulphate  <response>: Ans. c Kerosene. Ref. Parikh, Textbook of FMT, 5th684GASTRIC LAVAGE Useful only in first hour of ingestion Should be used in patients with altered sensorium Should not be used in contraindicated in patients with ingestion of alkalies and acids, kerosene poisoning and in stupourous and comatose patients. 