**Core Concept**
Nephrogenic diabetes insipidus (NDI) is a condition characterized by the kidneys' inability to concentrate urine in response to antidiuretic hormone (ADH), also known as vasopressin. This results in the production of large volumes of diluted urine, leading to dehydration and electrolyte imbalances.

**Why the Correct Answer is Right**
The correct treatment for NDI involves addressing the underlying cause, which is usually a defect in the V2 vasopressin receptor or an issue with the aquaporin-2 water channel. **Option C** (thiazide diuretics) is the correct answer because it increases the concentration of sodium in the distal tubule, leading to water reabsorption and reduced urine production. This mechanism is independent of ADH and can be effective in managing NDI.

**Why Each Wrong Option is Incorrect**
**Option A:** is incorrect because lithium can worsen NDI by inhibiting the V2 receptor, making the condition worse. **Option B:** is incorrect because it does not address the underlying pathophysiology of NDI and may even worsen the condition.

**Clinical Pearl / High-Yield Fact**
It's essential to note that NDI can be differentiated from central diabetes insipidus by the lack of response to desmopressin (a synthetic analogue of ADH). In NDI, the kidneys are unresponsive to ADH, whereas in central DI, the issue lies with the production of ADH.

**Correct Answer: C. Thiazide diuretics.**