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
An example of lyases is 
Select and explain. 
A. Glutamine synthetase, B. Fumarase, C. Cholinesterase, D. Amylase
B: Fumarase
Answer: B: Fumarase 
Explanation: None