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: Pathology
[{'content': 'The saliva does NOT contain: \nSelect and explain. \nA. Amylase, B. Lysozyme, C. Mucin, D. Hydrochloric acid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D:\xa0Saliva does not contain hydrochloric acid.\nA:\xa0The serous part of saliva, produced mainly by the parotid and submandibular glands, contains a digestive enzyme called\xa0salivary amylase.\nB:\xa0Saliva prevents bacterial\xa0infection\xa0in the mouth by washing the oral cavity, and it contains\xa0lysozyme, which has a weak antibacterial action.\nC:\xa0The serous part of saliva dissolves molecules, which must be in solution to stimulate taste receptors. The mucous secretions of the submandibular and sublingual glands contain a large amount of\xa0mucin, a proteoglycan that gives a lubricating quality tot he secretions of the salivary glands.', 'role': 'assistant'}]