<prompt> Consider the following - 1. Kerosene poisoning 2. Organo-phosphorus poisoning 3. Corrosive poisoning 4. Iron poisoning In which of the above is gastric lavage contraindicated?1 only1 and 3 only2 and 4 onlyl,2, 3and 4  <response>: Gastric lavage iscontraindicated in corrosive poisoningstrong acids and alkalis or if petroleum distillates kerosene have been ingested. Reference: Harrison20th edition pg 789 