This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Biochemistry
Ceruplasmin contains- 
Select and explain. 
A. Zn, B. Cu, C. Se, D. Fe
B: Cu
Answer: B: Cu 
Explanation: Ceruloplasmin is the major copper-carrying protein in the blood, and in addition plays a role in iron metabolism.