**Core Concept:** Tumour cells often exhibit enhanced rates of purine synthesis and increased demand for nucleotides due to their rapid proliferation. This results in elevated levels of uric acid production.

**Why the Correct Answer is Right:** Option D is correct because the increased demand for nucleotides in rapidly dividing tumour cells leads to enhanced production of uric acid. Gout is a well-known condition caused by high uric acid levels, often due to increased production or reduced excretion. Gout is more commonly associated with rapid cell division, such as in cancer, rather than with reduced uric acid production (which would result in low uric acid and hyperuricemia).

**Why Each Wrong Option is Incorrect:**

A. Gout is primarily caused by hyperuricemia due to reduced uric acid excretion, not increased production.
B. While purine degradation may be increased in certain tumors, the question specifies increased production, making this incorrect.
C. Tumors are not directly involved in uric acid production; the increase in uric acid is a result of the increased demand by rapidly dividing cells.

**Clinical Pearl / High-Yield Fact:** Hyperuricemia is often observed in cancer patients, specifically those with rapidly growing tumors, due to increased uric acid production by the tumor cells or increased demand for nucleotides. This can lead to gout-like symptoms and increased risk of kidney stones and renal impairment.

**Correct Answer:** D. Increased uric acid production due to the high demand for nucleotides in rapidly dividing tumor cells.