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
[{'content': 'In metabolism of xenobiotics, all of the following reactions occur in phase one except: \nSelect and explain. \nA. Oxidation, B. Reduction, C. Conjugation, D. Hydrolysis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Metabolic reactions may be classified into phase I (non-synthetic) and phase II (synthetic) reactions. Phase I\xa0reactions include oxidation, reduction, hydrolysis, cyclization and decylization etc. whereas phase II reactions include glucuronidation, acetylation,methylation, sulfation and glycine conjugation etc.', 'role': 'assistant'}]