<prompt> Gastric lavage is contraindicated in?Organo-Phosphosphate poisoningHydrocarbonsBicarbonatePCM toxicity  <response>: Contraindications of gastric lavage: Absolute: Corrosives to prevent fuher damage from perforation except carbolic acid - causes leathery mucosa of stomach - no risk of perforation. Relative: 1. Convulsant - may induce more convulsions 2. Comatose - change of aspiration.3. Varices - can cause bleeding 4. Volatile - hydrocarbons kerosene: risk of aspiration reading to chemical pneumonitis. 