## Core Concept
Ureteral obstruction can lead to acute kidney injury or chronic kidney damage, depending on the duration and severity of the obstruction. The obstruction can occur at any point along the ureter, from the renal pelvis to the bladder. Ureteral obstruction affects renal function by increasing pressure in the renal pelvis, which can lead to a decrease in renal blood flow and glomerular filtration rate.

## Why the Correct Answer is Right
The correct answer involves understanding the physiological changes that occur due to ureteral obstruction. When a ureter is obstructed, it leads to a series of changes including an increase in pressure in the renal pelvis and a subsequent decrease in renal blood flow. This decrease in blood flow activates the renin-angiotensin-aldosterone system (RAAS), leading to vasoconstriction and further reduction in glomerular filtration rate (GFR). The kidney's ability to autoregulate and maintain GFR despite changes in blood pressure is impaired.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is incorrect because it does not accurately describe a consequence of ureteral obstruction.
- **Option B:** This option is incorrect as it does not relate to the physiological or pathological changes seen in ureteral obstruction.
- **Option C:** Although not directly provided, any option that does not align with established physiological responses to ureteral obstruction would be incorrect based on the specifics of renal physiology and the effects of obstruction.

## Clinical Pearl / High-Yield Fact
A key clinical point to remember is that ureteral obstruction can lead to hydronephrosis, which is the swelling of a kidney due to a build-up of urine. This condition can be diagnosed with imaging studies such as ultrasound or CT scans. Early recognition and relief of obstruction are crucial to prevent long-term kidney damage.

## Correct Answer Line
**Correct Answer: C.**