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': 'Commonest salivary gland to get stones \nSelect and explain. \nA. Parotid, B. Submandibular, C. Minor salivary gland, D. Sublingual', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Eighty per cent of all salivary stones occur in the submandibular glands because their secretions are relatively viscous. Eighty per cent of submandibular stones are radio-opaque and can be identified on plain radiography. Stones are mainly composed of phosphate and oxalate salts.Ref: Bailey and love, 27e, page no: 780', 'role': 'assistant'}]