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: Surgery
[{'content': 'All are true for plemorphic adenoma except? \nSelect and explain. \nA. Arises from parotid, B. May turn into malignant, C. Minor salivary glands involved, D. None', 'role': 'user'}, {'content': "Answer: D \nExplanation: Answer is 'd' i.e. None Pleomorphic adenomas arise most commonly in the parotid gland. These form majority (-80-90%) of tumors of the parotid gland. Pleomorphic adenomas are less common in the submandibular glands & sublingual glands; relatively rare in the minor glands. Pleomorphic adenomas are benign tumors derived from a mixture of ductal (epithelial) and myoepithelial cells, and therefore show both epithelial and mesenchymal differentiation (hence k/a mixed tumor) Although benign, it has the potential to turn malignant k/a carcinoma ex pleomorphic adenoma or malignant mixed tumor. The incidence of malignant transformation increases with the duration of the tumor Signs & symptoms suspicious of malignant transformation a) rapid growth b) pain c) paresthesias d) facial weakness e) skin invasion and fixation of mastoid tip.", 'role': 'assistant'}]