This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
Which of the following enzymes does NOT contain Cu2+? 
Select and explain. 
A. Ceruloplasmin, B. Cytochrome Oxidase, C. Xanthine oxidase, D. Superoxide Dismutase
C: Xanthine oxidase
Answer: C: Xanthine oxidase 
Explanation: Dopamine hydroxylase Peptidylglycine hydroxylase, Ceruloplasmin(copper containg plasma protein, enzyme) Amine oxidase Copper-dependent superoxide dismutase Cytochrome oxidase Tyrosinase lysyl oxidase Hephaestin, ferroxidase Ascorbic acid has specific roles in the copper-containing hydroxylases and the -ketoglutarate-linked iron-containing hydroxylases Superoxide diamutase is Zn containing