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
All steps of N- glycosylation occur in ER except 
Select and explain. 
A. Dolichol synthesis, B. Glycosyl transferase, C. Protein- oligosacharide transferase, D. Final trimming
D: Final trimming
Answer: D: Final trimming 
Explanation: D i.e. Final trimming