This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of carbohydrate, Subject name: Biochemistry
Rate limiting enzyme in glycolysis? 
Select and explain. 
A. Glucokinase, B. Phosphofructokinase-1, C. Phosphoglycerate kinase, D. Enolase
B: Phosphofructokinase-1
Answer: B: Phosphofructokinase-1 
Explanation: None