**Core Concept**
The stomach wash for phenol poisoning involves using a specific agent that can effectively neutralize the toxic effects of phenol in the gastrointestinal tract. Phenol is a highly toxic and corrosive substance that can cause significant damage to the mucosal lining of the stomach and intestines.

**Why the Correct Answer is Right**
The correct answer is **water**. Water is used as the stomach wash for phenol poisoning because it helps to dilute the concentration of phenol in the stomach, thereby reducing its toxic effects. Additionally, water can help to flush out the phenol from the stomach, preventing further absorption and potentially reducing the severity of the poisoning.

**Why Each Wrong Option is Incorrect**
**Option A:** **Sodium bicarbonate** is not the preferred agent for stomach wash in phenol poisoning. While sodium bicarbonate can help to neutralize acidic substances, it may not be effective in neutralizing the toxic effects of phenol.

**Option B:** **Activated charcoal** is not typically used as a stomach wash for phenol poisoning. While activated charcoal can be used to treat certain types of poisoning, it is not effective in neutralizing the toxic effects of phenol.

**Option C:** **Gastric lavage** with a specific agent is not the correct answer. While gastric lavage may be performed in cases of phenol poisoning, the agent used is water, not a specific chemical.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the stomach wash for phenol poisoning should be performed immediately after ingestion, as the sooner the treatment is initiated, the better the outcome.

**Correct Answer: D. Water**