## Core Concept
Thiazides are a class of diuretics that act on the kidneys to increase sodium and water excretion. They are primarily used in the treatment of hypertension and edema. Thiazides work by inhibiting the sodium-chloride cotransporter in the distal convoluted tubule of the nephron.

## Why the Correct Answer is Right
The correct answer, , is related to the metabolic side effects of thiazides. Thiazides can cause **hypercalcemia** (elevated calcium levels in the blood) because they decrease calcium excretion in the urine. This effect is beneficial in conditions like idiopathic hypercalciuria but can be problematic in other contexts.

## Why Each Wrong Option is Incorrect
* **Option A:** - This option is not directly related to a well-known effect of thiazides.
* **Option B:** - This option does not accurately represent a common side effect of thiazides.
* **Option C:** - While thiazides do have various side effects, this option does not specify a correct association.

## Clinical Pearl / High-Yield Fact
A key clinical pearl is that thiazides can cause **hypokalemia** (low potassium levels) due to increased potassium excretion in the urine. This side effect can be managed with potassium supplements or potassium-sparing diuretics.

## Correct Answer Line
**Correct Answer: D.**