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: Dental
[{'content': 'Salivary pellicle is composed of the following except: \nSelect and explain. \nA. Immunoglobulin G, B. Immunoglobulin A, C. Amylase, D. Albumin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]