All the following are preserved in Charcot-Marie-Tooth disease EXCEPT

Correct Answer: B

Rationale: Tibial nerves are not preserved in CMT; they are commonly affected, contributing to distal leg weakness.

Correct Answer: D

Rationale: CSF in CIDP typically shows high protein without pleocytosis (albuminocytologic dissociation), unlike GBS where pleocytosis can occur.

Correct Answer: D

Rationale: The text lists anorexia, growth faltering, and immune impairment as mild zinc deficiency symptoms, making D (all of the above) correct.

Correct Answer: C

Rationale: Potassium is the most abundant intracellular cation, a well-established fact in physiology, consistent with the context of the question.

Correct Answer: B

Rationale: Cholestatic liver disease is a severe, frequent complication of prolonged parenteral nutrition, often more concerning than others.