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 does not belong to isomerase class of enzyme? 
Select and explain. 
A. Mutase, B. Racemase, C. Phosphohexoisomerase, D. Transaminase
D: Transaminase
Answer: D: Transaminase 
Explanation: Transaminase belongs to transferases class of enzyme.