A nurse is teaching a client with a history of struvite stones about dietary modifications to prevent stone recurrence. Which instruction should the nurse include in the client's plan of care?

A. Excessive consumption of fruits and vegetables is not a primary cause of kidney stones. Some specific types of fruits and vegetables may contribute to stone formation, but it is not a general cause.

B. While genetic factors and family history can play a role in kidney stone formation, they are not the primary cause. The presence of minerals and salts in the urine is the main contributing factor.

C. An overactive bladder and frequent urination are not direct causes of kidney stone formation. They may be related to other urinary conditions but not to the formation of kidney stones.

D. This is the correct answer. Kidney stones are formed when certain minerals and salts in the urine form solid crystals that can clump together and grow into stones.

A. Thiazide diuretics do not directly increase the excretion of uric acid. They are primarily used to reduce calcium excretion and prevent the formation of calcium-based stones.

B. This is the correct answer. Thiazide diuretics help reduce the excretion of calcium in the urine, which can be beneficial in preventing the formation of certain types of kidney stones, particularly calcium oxalate stones.

C. Thiazide diuretics do not directly increase the pH of the urine. They primarily reduce calcium excretion.

D. Thiazide diuretics do not dissolve existing kidney stones. They are used to prevent stone formation, not to treat existing stones.