This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Enzymes), Subject name: Biochemistry
Cofactor of carbonic anhydrase is? 
Select and explain. 
A. Molybdenum, B. Zinc, C. Copper, D. Selenium
B: Zinc
Answer: B: Zinc 
Explanation: Ans. (b) ZincRefiText of Biochemistry By G.P Talwar and LMSrivastava p 585, Shinde and Chatterjee 6th ed /-555