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
Which of the following is not a phase I reaction 
Select and explain. 
A. Oxidation, B. Deamination, C. Dealkylation, D. Sulfation
D: Sulfation
Answer: D: Sulfation 
Explanation: Sulfation is a phase II metabolic reaction where a conjugate group is attached to the drug, whereas phase I reactions are oxido -reductive reactions.