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
According to IUB system, hydrolases belong to which class ? 
Select and explain. 
A. EC-1, B. EC-2, C. EC-3, D. EC-4
C: EC-3
Answer: C: EC-3 
Explanation: Ans. is 'c' i.e., EC-3IUB classificationEnzyme code number (EC number)EnzymeEC-1OxidoreductaseEC-2TransferaseEC-3HydrolasesEC-4LyasesEC-5IsomerasesEC-6Ligases