Final answer:
The lower extremity or foot finding that is a sign of sensory neuropathy in a patient with diabetes mellitus is dusky when legs are dependent.
Step-by-step explanation:
The lower extremity or foot finding that is a sign of sensory neuropathy in a patient with diabetes mellitus is A. Dusky when legs are dependent. Diabetic neuropathy is a common complication of diabetes that can result in numbness, tingling, and pain in the extremities. When a patient with sensory neuropathy has legs that appear dusky when they are dependent, it suggests impaired blood flow and oxygenation, which is a characteristic sign of sensory neuropathy.