**Core Concept**
Lesch-Nyhan syndrome is a genetic disorder caused by a deficiency of the enzyme hypoxanthine-guanine phosphoribosyltransferase (HGPRT). This enzyme plays a crucial role in the purine salvage pathway, which recycles purine bases to form nucleotides.

**Why the Correct Answer is Right**
The defective recycling of hypoxanthine, a purine base, leads to an accumulation of uric acid in the body. This results in severe hyperuricemia, which causes the clinical manifestations of Lesch-Nyhan syndrome. The purine salvage pathway is essential for maintaining normal purine levels in the body, and a deficiency in HGPRT disrupts this process.

**Why Each Wrong Option is Incorrect**
* **Option A:** Adenine is not directly involved in the purine salvage pathway, and its recycling is not affected in Lesch-Nyhan syndrome.
* **Option B:** Guanine is a purine base, but its recycling is not the primary issue in Lesch-Nyhan syndrome. The defect lies in the recycling of hypoxanthine to guanine.
* **Option D:** This option is missing, but assuming it's a distractor, it's likely a different biochemical compound that's not directly related to the purine salvage pathway.

**Clinical Pearl / High-Yield Fact**
Lesch-Nyhan syndrome is characterized by a triad of symptoms: intellectual disability, self-mutilating behavior, and gouty arthritis. This syndrome is a classic example of a genetic disorder causing a metabolic defect that leads to severe clinical manifestations.

**Correct Answer:** C.