This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
[{'content': 'Most common salivary gland involved by stone is \nSelect and explain. \nA. Parotid, B. Submandibular, C. Minor, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Eighty percent of all salivary stones occur in the submandibular gland, 10% occur in parotid, 7% in the sublingual and the remainder occurs in minor salivary glands" Eighty percent of submandibular stones are radio-opaque and can be identified on plain radiographs. In contrast parotid stones are usually radiolucent and rarely visible on plain radiography. Ref : Bailey & Love 25/e p755', 'role': 'assistant'}]