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
Enzymes help by: 
Select and explain. 
A. Lowering the activation energy, B. Increasing the substrate concentration, C. Decreasing the surface tension, D. Increasing the activation energy
A: Lowering the activation energy
Answer: A: Lowering the activation energy 
Explanation: None