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
[{'content': 'An example of metalloprotein is \nSelect and explain. \nA. Casein, B. tyrosinase, C. Gelatin, D. Salmine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Metalloproteins: They contain metal ions. Examples are Hemoglobin (Iron), Cytochrome (Iron), Tyrosinase (Copper) and Carbonicanhydrase (Zinc).\nReference: Vasudevan 7th\xa0 ed, pg 43', 'role': 'assistant'}]