This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Salivary Gland, Subject name: Surgery
[{'content': 'Salivary gland stone most commonly associated with - \nSelect and explain. \nA. Submandibular gland, B. Parotid gland, C. Sublingual gland, D. Minor-salivary gland', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) (Submandibular gland) (483 - S. Das 7th) (727 - Baily & Lake 26th)* Salivary stones are ore common in the submandibular saligand gland than in parotid gland.* Stones develop more frequently within the duct of the submandibular gland (Wharton\'s duct).* Main content is calcium and magnesium phosphate (same as tarter of tooth).* Painful swelling during meal is the most important symptoms.* 80% of submandibular stones are radio-opaque and can be identified on plain radiography.* Acute parotitis is a contraindicated for sialography.* Warthin\'s tumour is - An adenolymphoma of parotid (Papillary cystadenoma lvmphomatusum) gland.* Common in males, 5th to 1th decade, never turns malignant.* Show\'s "hot spot" in Tc99 pertechnate scan, other tumours of the parotid show \'cold spot\'* Treatment - superficial parotidectomy.Godwin\'s tumour - Benign lymphoepithelial tumour of parotid gland.Ranula - is a retention cyst of minor salivary glands (Glands of Bandin and Nuhn).* Present as transluscent bluish, swelling in the floor of the mouth, lying one side of the midline.* Complete excision or marsupialization for large cyst.* Mixed tumours (pleomorphic adenoma) are most common in the parotid gland.', 'role': 'assistant'}]