**Core Concept**
The conversion of glucose to sorbitol is an important metabolic pathway that occurs in the human body, particularly in the lens of the eye. This process is mediated by the enzyme aldose reductase, which catalyzes the reduction of glucose to sorbitol using NADPH as a cofactor.

**Why the Correct Answer is Right**
Aldose reductase is a key enzyme in the polyol pathway, which is activated in conditions of hyperglycemia. In the lens of the eye, the accumulation of sorbitol due to increased glucose levels can lead to osmotic stress and contribute to the development of diabetic cataracts. The sorbitol pathway is also implicated in the pathogenesis of diabetic complications, including neuropathy and nephropathy.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not a correct answer as it is not a known enzyme involved in the conversion of glucose to sorbitol.
* **Option B:** This option is not a correct answer as it is not directly involved in the conversion of glucose to sorbitol.
* **Option C:** This option is not a correct answer as it is not a known enzyme involved in the conversion of glucose to sorbitol.

**Clinical Pearl / High-Yield Fact**
The polyol pathway is particularly active in the lens of the eye and the kidneys, where it can contribute to the development of diabetic complications. The use of aldose reductase inhibitors has been explored as a potential therapeutic strategy for preventing or treating diabetic complications.

**Correct Answer:** A. Aldose reductase.