**Core Concept**
Gastric lavage is a procedure used to remove ingested toxins from the stomach. However, its use is limited due to potential complications and contraindications. The underlying principle being tested involves understanding the risks associated with gastric lavage in specific poisoning scenarios.

**Why the Correct Answer is Right**
Gastric lavage is contraindicated in corrosive poisoning, particularly with strong acids or bases, as it can cause further damage to the esophageal and gastric mucosa. The esophagus and stomach are lined with mucous membranes that can be severely injured by strong corrosives, leading to perforation, stricture, or other complications. Performing gastric lavage in such cases can exacerbate the injury and worsen the outcome.

**Why Each Wrong Option is Incorrect**
**Option A:** Not applicable, as the question is asking for a specific contraindication.
**Option B:** Gastric lavage may be considered in cases of poisoning with certain medications, such as antacids or acid reducers, but it is not contraindicated in these scenarios.
**Option C:** Gastric lavage may be useful in certain cases of poisoning, such as with sedatives or opioids, but it is not contraindicated in these scenarios.

**Clinical Pearl / High-Yield Fact**
In cases of corrosive poisoning, it is essential to prioritize endoscopic assessment and treatment to minimize the risk of complications. Activated charcoal may be administered to help absorb the corrosive substance, but gastric lavage should be avoided.

**Correct Answer:** C. Corrosive poisoning.