This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzymes, Subject name: Biochemistry
Enzymes act by reducing the 
Select and explain. 
A. Activation energy, B. Binding energy, C. Heat energy, D. Covalent energy
A: Activation energy
Answer: A: Activation energy 
Explanation: "All enzymes accelerate reaction rates by lowering activation energy for the formation of transition states."Activation energy is the minimum energy required to sta a chemical reaction.Harper 30th edition pg: 77