Final answer:
Captopril (Capoten) is the ACE inhibitor medication that helps preserve renal function in diabetic clients.
Explanation:
Captopril (Capoten) is the medication that preserves renal function in a client with diabetes. Captopril belongs to the class of medications known as angiotensin-converting enzyme (ACE) inhibitors, which are beneficial in protecting the kidneys in diabetic patients by reducing blood pressure and decreasing stress on the kidneys.
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