## **Core Concept**
Gastric lavage, also known as stomach pumping, is a procedure where the stomach is flushed with liquids to remove toxic substances. It is considered in cases of poisoning but is most effective when performed shortly after ingestion. The procedure's effectiveness and safety depend on the type of poison ingested.

## **Why the Correct Answer is Right**
The correct answer, **D. Corrosive poisoning**, is the one for which gastric lavage might still be considered, albeit with caution. In corrosive poisoning (e.g., ingestion of acids or alkalis), the damage is immediate to the esophagus and stomach lining. However, the procedure is generally avoided due to the risk of perforation. Despite this, it's sometimes argued for in specific scenarios of corrosive ingestion if very early after ingestion and with careful technique.

## **Why Each Wrong Option is Incorrect**
- **Option A: Arsenic poisoning**. Gastric lavage might be considered in some poisonings if done early, but it's not specifically indicated for arsenic poisoning where the focus is more on supportive care and specific antidotes.
- **Option B: Organophosphate poisoning**. The treatment involves atropine and pralidoxime; gastric lavage might be considered very early but is not a mainstay.
- **Option C: Sedative overdose**. While supportive care and monitoring are critical, gastric lavage is generally not recommended for sedative overdose due to low yield and risk.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that gastric lavage is generally not recommended for most poisonings if more than 1 hour has passed since ingestion due to limited efficacy and potential complications. It's crucial to assess the patient's airway, breathing, and circulation (ABCs) first and consider activated charcoal for many types of poisoning.

## **Correct Answer: D. Corrosive poisoning**