This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzymes, Subject name: Biochemistry
Enzyme causing covalent bond cleavage without hydrolysis 
Select and explain. 
A. Lyase, B. Ligase, C. Hydrolase, D. Transferase
A: Lyase
Answer: A: Lyase 
Explanation: These enzymes can remove groups from substrates or break bonds by mechanisms other than hydrolysis. For example, Fructose-1,6-bisphosphate -------- Glyceraldehyde-3-phosphate +dihydroxy acetone phosphateRef: DM Vasudevan, Page no: 41