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 glycolytic enzyme does not catalyze irreversible step ? 
Select and explain. 
A. Hexokinase, B. Phosphoglycerate kinase, C. Phosphofructokinase, D. Pyruvate kinase
B: Phosphoglycerate kinase
Answer: B: Phosphoglycerate kinase 
Explanation: Ans. is 'b' i.e., Phosphoglycerate kinaseIrreversible steps are catalyzed by :- Glucokinase / Hexokinase, phosphofructokinase-I, and pyruvate kinase.Reversible steps are catalyzed by :- Phosphohexose isomerase, aldolase, phosphotriose isomerase, glyceraldehyde 3-phosphate dehydrogenase, phosphoglycerate kinase, phosphoglycerate mutase, Enolase.