**Core Concept**
Gastric lavage is a medical procedure to remove ingested substances from the stomach. However, it has specific contraindications, particularly in cases of poisoning where the procedure may cause more harm than good.

**Why the Correct Answer is Right**
In cases of poisoning with corrosive substances, gastric lavage is contraindicated because it can cause further irritation and damage to the esophageal and gastric mucosa. This can lead to severe complications, including perforation, stricture, and even death. Corrosive substances, such as strong acids or bases, can cause immediate damage to the mucosa, making the stomach lining more susceptible to further injury.

**Why Each Wrong Option is Incorrect**
* **Option A:** Not mentioned, please provide a valid option.
* **Option B:** Not mentioned, please provide a valid option.
* **Option C:** Not mentioned, please provide a valid option.
* **Option D:** Not mentioned, please provide a valid option.

**Clinical Pearl / High-Yield Fact**
When dealing with poisoning, it's essential to consider the type of substance ingested and its potential effects on the gastrointestinal tract. Corrosive substances require immediate medical attention, but gastric lavage is not the recommended treatment.

**Correct Answer:** C. Corrosive substances.