This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mechanisms of Enzyme Action, Subject name: Biochemistry
Alcohol dehydrogenase is a/an - 
Select and explain. 
A. Transferase, B. Hydrolase, C. Ligase, D. Oxidoreductase
D: Oxidoreductase
Answer: D: Oxidoreductase 
Explanation: Ans. is 'd' i.e., Oxidoreductase o Alcohol dehydrogenase is a NAD-linked dehydrogenase (oxidoreductase)o It catalyzes the oxidation of ethanol to acetaldehyde.