**Core Concept**
Chemical peeling is a non-invasive cosmetic procedure that involves applying a solution to remove the top layers of the skin, promoting cell turnover and rejuvenation. This process helps to improve skin texture, reduce fine lines, and address various skin concerns such as acne, hyperpigmentation, and scars.

**Why the Correct Answer is Right**
Chemical peeling works by inducing a controlled wound response in the skin, which triggers the release of growth factors and stimulates collagen production. The solution penetrates the skin and breaks down the intercellular connections, allowing the top layers to slough off. The most commonly used peeling agents include alpha-hydroxy acids (AHAs), beta-hydroxy acids (BHAs), and trichloroacetic acid (TCA).

**Why Each Wrong Option is Incorrect**
**Option A:** Glycolic acid is a type of AHA commonly used in chemical peeling, making it a correct choice.
**Option B:** Salicylic acid is a BHA that is often used in chemical peeling, particularly for treating acne and hyperpigmentation.
**Option C:** Phenol is a strong peeling agent used in deeper chemical peeling, also known as phenol peeling, which is often used to treat deeper wrinkles and scars.

**Clinical Pearl / High-Yield Fact**
When choosing a chemical peeling agent, it's essential to consider the skin type, depth of peeling desired, and potential side effects. Always patch test the solution and start with a lower concentration to avoid adverse reactions.

**Correct Answer: D.**