**Core Concept**
Albinism is a group of rare genetic disorders characterized by a reduction or complete lack of melanin production, leading to skin, hair, and eye color abnormalities. The condition is caused by defects in the genes responsible for melanin synthesis.

**Why the Correct Answer is Right**
The production of melanin involves a complex biochemical pathway that starts with the amino acid tyrosine. The enzyme tyrosinase is a key player in this pathway, catalyzing the conversion of tyrosine to melanin. In albinism, the deficiency of tyrosinase leads to a complete block in melanin production. This results in a lack of pigmentation in the skin, hair, and eyes. The defective gene responsible for albinism encodes for the tyrosinase enzyme, which is essential for melanin synthesis.

**Why Each Wrong Option is Incorrect**
* **Option A:** Phenylalanine hydroxylase is an enzyme involved in the metabolism of the amino acid phenylalanine and is deficient in phenylketonuria (PKU), not albinism.
* **Option B:** Aldehyde dehydrogenase is an enzyme involved in the breakdown of aldehydes, but it is not related to melanin synthesis or albinism.
* **Option D:** Glucose-6-phosphatase is an enzyme involved in glucose metabolism, particularly in glycogen storage diseases, and is not related to melanin production or albinism.

**Clinical Pearl / High-Yield Fact**
Albinism is a rare but important condition to recognize, as it can lead to increased susceptibility to skin cancer due to the lack of melanin, which provides natural protection against UV radiation.

**Correct Answer:** C. Tyrosinase.