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
[{'content': 'Mucin is a? \nSelect and explain. \nA. Nucleoprotein, B. Glycoprotein, C. Phosphoprotein, D. Chromoprotein', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]