This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Menkes Kinky hair syndrome is characterized by a congenital deficiency of 
Select and explain. 
A. Serum ceruloplasmin, B. Serum copper, C. Ferochelatase, D. Copper binding ATPase
D: Copper binding ATPase
Answer: D: Copper binding ATPase 
Explanation: Menkes disease ("Kinky" or "steely" hair disease) is a disorder of copper metabolism due to mutations in the gene for a copper-binding P-type ATPase, i.e. ATP7A gene.