This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
[{'content': 'Major site of protein glycosylation is \nSelect and explain. \nA. ER and golgi body, B. Ribosome and golgi body, C. ER and ribosome, D. Ribosome and cytoplasm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Because many glycosylation reactions occur within the lumen of the Golgi apparatus, carrier systems (permeases and transpoers) are required to transpo nucleotide sugars across the Golgi membrane.Ref: Harpers Illustrated Biochemistry, 30th edition, page no: 572', 'role': 'assistant'}]