**Core Concept:** Gastric lavage is a procedure involving the flushing of the stomach contents using a large quantity of water or a specific solution, typically performed in cases of suspected ingestion of toxic substances. It is a method to neutralize, remove, or inactivate toxic substances, thereby reducing the absorption and potential harm caused by the ingested substances.

**Why the Correct Answer is Right:** Gastric lavage is ideally indicated in all cases of acute poisoning because it serves several critical purposes:

1. **Prevention of further absorption:** By emptying the stomach contents, gastric lavage reduces the amount of toxic substances that can be absorbed into the systemic circulation. This helps to minimize the toxic effects and potential harm to the patient.
2. **Neutralization of poison:** Using antidotes or specific solutions during gastric lavage can neutralize or inactivate a variety of toxic substances, thereby rendering them less harmful to the patient.
3. **Removal of the poison:** By washing out the ingested toxin, gastric lavage can prevent the toxin from being absorbed further into the gastrointestinal tract and potentially reaching vital organs.

**Why Each Wrong Option is Incorrect:**

A. **Option A:** While the procedure may help in some cases, gastric lavage is not always the first line of treatment for poisoning. Depending on the type of poison, other interventions might be more effective or appropriate.

B. **Option B:** This option suggests that gastric lavage is only indicated in cases of ingestion of corrosive substances. In reality, gastric lavage is indicated in a broader range of poisoning scenarios.

C. **Option C:** This option implies that gastric lavage is only beneficial for poisoning caused by ingestion of corrosive substances. In fact, gastric lavage is beneficial in a variety of poisoning cases, not limited to corrosive substances.

D. **Option D:** This option states that gastric lavage is only useful in poisoning caused by non-poisoning substances. Gastric lavage plays a role in managing poisoning due to various substances, not just non-poisoning ones.

**Clinical Pearl:** In cases of suspected poisoning, the decision to perform gastric lavage should be based on the type of poison, the time since ingestion, the severity of symptoms, and the presence of life-threatening complications, among other factors. While gastric lavage can be beneficial in a wide range of poisoning scenarios, its effectiveness and appropriateness can vary depending on the specific poison, patient's condition, and other factors. It is crucial for medical professionals to consider these factors before deciding to perform gastric lavage.