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
Which of the following enzyme uses zinc as a cofactor for its biochemical functions? 
Select and explain. 
A. Pyruvate dehydrogenase, B. Pyruvate decarboxylase, C. a-ketoglutarate dehydrogenase, D. Alcohol dehydrogenase
D: Alcohol dehydrogenase
Answer: D: Alcohol dehydrogenase 
Explanation: Zinc containing enzymes are: Alcohol dehydrogenase Carbonic anhydrase Retinine reductase Alkaline phosphatase Glutamate dehydrogenase Lactate dehydrogenase DNA and RNA polymerase d-ALA dehydratase Ref: Medical Biochemistry By Chatterjea, 2011, Page 627.