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
An example of metalloprotein is 
Select and explain. 
A. Casein, B. tyrosinase, C. Gelatin, D. Salmine
B: tyrosinase
Answer: B: tyrosinase 
Explanation: Metalloproteins: They contain metal ions. Examples are Hemoglobin (Iron), Cytochrome (Iron), Tyrosinase (Copper) and Carbonicanhydrase (Zinc).
Reference: Vasudevan 7th  ed, pg 43