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: Pharmacology
In metabolism of xenobiotics, all of the following reactions occur in phase one EXCEPT ? 
Select and explain. 
A. Oxidation, B. Reduction, C. Conjugation, D. Hydrolysis
C: Conjugation
Answer: C: Conjugation 
Explanation: None