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
Oxidation in pentose phosphate pathway utilises: 
Select and explain. 
A. Oxidative phase, B. Non oxidative phase, C. Both of the above, D. None of the above
A: Oxidative phase
Answer: A: Oxidative phase 
Explanation: The enzymes of the pentose phosphate pathway act in the sequence of reactions of the pathway may be divided into two phases: an oxidative nonreversible phase and a nonoxidative reversible phase. Ref: Harper 28th edition, Chapter 21.