Copper deficiency can cause paresthesias in the extremities.

• A. Hyperkalemia
• B. Paresthesias in the extremities
• C. Cough
• D. Edema

Answer: (B)

Copper supports nerve function and myelin maintenance; when levels are low, nervous tissue can degenerate and produce sensory neuropathy, including tingling or numbness in the extremities. This paresthesia reflects the neurologic impact of copper deficiency and is the most direct manifestation among the options. The other symptoms listed are not characteristic features of copper deficiency—hyperkalemia points to electrolyte imbalance, cough to airway/respiratory issues, and edema to fluid overload or other conditions—so they don’t fit the typical neurologic pattern seen with copper lack.