Which of the following is LEAST characteristically listed among the classic microvascular complications of diabetes mellitus?

Correct answer: D. Cardiomyopathy

• A. Diabetic nephropathy is a classic microvascular complication and the leading cause of end-stage renal disease. It changes dental practice through drug clearance and bleeding tendency in uraemia.
• B. Diabetic retinopathy is a classic microvascular complication and a leading cause of adult blindness, driven by chronic hyperglycaemic damage to retinal capillaries.
• C. Diabetic neuropathy is one of the three classic microvascular complications. It matters directly in dentistry — peripheral neuropathy can blunt pain perception and altered oral sensation may present as burning mouth.
• D. CORRECT as the intended EXCEPTION. The three classic MICROVASCULAR complications of diabetes are retinopathy, nephropathy and neuropathy — the triad that board questions expect. Cardiomyopathy is the odd one out in that grouping because cardiac disease in diabetes is classified as MACROvascular, alongside stroke and peripheral arterial disease.

Note: ⚑ Worth arguing in the group. Diabetic cardiomyopathy is a REAL and well-described entity — ventricular dysfunction in diabetics without coronary disease, hypertension or valvular disease. So the item is only defensible if you read it as asking for the classic MICROvascular triad, which is how the source intended it. If an exam offers a genuinely unrelated option, take that one instead.