**Core Concept**
Tumor lysis syndrome (TLS) is a life-threatening condition that occurs when a large number of cancer cells die rapidly, releasing their contents into the bloodstream. This leads to a series of electrolyte and metabolic disturbances.

**Why the Correct Answer is Right**
TLS is characterized by the release of intracellular contents, including potassium, phosphate, and nucleic acids. This results in hyperkalemia, hyperphosphatemia, and hypocalcemia. Additionally, the breakdown of nucleic acids leads to the production of uric acid, causing hyperuricemia. The kidneys may become overwhelmed, leading to acute kidney injury.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because TLS is not typically associated with hypokalemia. In fact, hyperkalemia is a hallmark of the condition.
* **Option B:** This option is incorrect because hyperphosphatemia is a common feature of TLS, not hypophosphatemia.
* **Option C:** This option is incorrect because hyperuricemia is a characteristic of TLS, not hypouricemia.

**Clinical Pearl / High-Yield Fact**
TLS can occur in patients with rapidly proliferating cancers, such as acute lymphoblastic leukemia (ALL) or lymphoma. It is essential to monitor electrolyte levels and renal function in these patients, and to consider preventive measures such as allopurinol or rasburicase.

**Correct Answer: A.**