**Core Concept**
Recurrent urinary tract infections (UTIs) can lead to the formation of specific types of kidney stones, known as struvite stones or magnesium ammonium phosphate stones. This occurs due to the alkaline environment created by urease-producing bacteria, which break down urea into ammonia and carbon dioxide.

**Why the Correct Answer is Right**
The alkaline environment created by the bacterial urease enzyme promotes the precipitation of magnesium ammonium phosphate, leading to the formation of struvite stones. This type of stone is often associated with patients who have a history of recurrent UTIs, particularly those caused by urease-producing bacteria such as Proteus, Pseudomonas, and Klebsiella. The struvite stones can grow rapidly and cause significant damage to the renal parenchyma if left untreated.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because calcium oxalate stones are the most common type of kidney stone, but they are not specifically associated with recurrent UTIs.
**Option B:** Incorrect because uric acid stones are more commonly associated with conditions such as gout, high uric acid levels, and certain medications.
**Option C:** Incorrect because cystine stones are a rare type of stone that occurs in patients with cystinuria, a genetic disorder that affects the kidneys' ability to reabsorb cystine.

**Clinical Pearl / High-Yield Fact**
Recurrent UTIs can be a significant risk factor for the development of struvite stones, so it is essential to identify and treat underlying bacterial infections promptly to prevent stone formation.

**Correct Answer:** D. Struvite stones