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
[{'content': 'Enzyme causing covalent bond cleavage without hydrolysis ? \nSelect and explain. \nA. Lyase, B. Ligase, C. Hydrolase, D. Transferase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cleavage by hydrolysis (addition of water) -p Hydrolases\nCleavage without hydrolysis (without addition of water) —> Lyases', 'role': 'assistant'}]