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
Maximum energy is liberated by hydrolysis of ? 
Select and explain. 
A. Creatine phosphate, B. ATP, C. Phosphoenol pyruvate, D. Glucose-6-phosphate
C: Phosphoenol pyruvate
Answer: C: Phosphoenol pyruvate 
Explanation: A compound that liberates 7 Kcal/n:ol or more on hydrolysis is called high energy compound, or a compound that on hydrolysis undergoes a large (. 7 kcal/mol) decrease in free energy (AG) under standard condition is called high energy compound, i.e., AG - 7 Kcal/mol.