**Core Concept**
Polyuria is a condition characterized by the excessive production of urine, typically defined as more than 3 liters per day in adults. It can result from various underlying causes, including renal, hormonal, and metabolic disorders. Understanding the pathophysiology of polyuria is crucial in diagnosing and managing related conditions.

**Why the Correct Answer is Right**
Rhabdomyolysis is a condition where muscle tissue breaks down, releasing myoglobin and other waste products into the bloodstream. While it can cause acute kidney injury, rhabdomyolysis is not typically associated with polyuria. In contrast, the other options can directly contribute to polyuria:

* **Option A (Interstitial nephritis):** This condition involves inflammation of the spaces between the renal tubules, leading to impaired kidney function and, subsequently, polyuria.
* **Option B (Hypokalemia):** Low potassium levels can cause increased urine production by activating the renin-angiotensin-aldosterone system, leading to polyuria.
* **Option C (A.D.H insufficiency):** Central diabetes insipidus is caused by the deficiency of antidiuretic hormone (ADH), which regulates water reabsorption in the kidneys, resulting in polyuria.

**Why Each Wrong Option is Incorrect**
**Option A:** While interstitial nephritis can cause polyuria, rhabdomyolysis is not typically associated with this condition.

**Option B:** Hypokalemia can cause polyuria through its effects on the renin-angiotensin-aldosterone system, but rhabdomyolysis does not typically present with this electrolyte imbalance.

**Option C:** Central diabetes insipidus, caused by ADH insufficiency, is a classic cause of polyuria, whereas rhabdomyolysis is not directly related to ADH levels.

**Clinical Pearl / High-Yield Fact**
When evaluating a patient with polyuria, it is essential to consider the underlying causes, including renal, hormonal, and metabolic disorders. In particular, central diabetes insipidus should be considered in patients presenting with polyuria and normal serum glucose levels.

**✓ Correct Answer: D. Rhabdomyolysis**