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
Carboxypeptidase contains which mineral ? 
Select and explain. 
A. Copper, B. Zinc, C. Iron, D. None
B: Zinc
Answer: B: Zinc 
Explanation: Ans. is 'b' i.e., Zinc Zinc containing enzymes are carboxypeptidase, carbonic anhydrase, alkaline phosphatase, lactate dehydrogenase, alcohol dehydrogenase, glutamate dehydrogenase, RNA polymerase and superoxide dismutase.