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': 'Leisegang rings are found in: \nSelect and explain. \nA. Calcifying epithelial odontogenic cyst, B. Primordial cyst, C. Calcifying epithelial odontogenic tumor, D. Odontoma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Characteristic feature of the Calcifying epithelial odontogenic tumor (Pindborg tumour) is\xa0the\xa0presence\xa0of\xa0calcification,\xa0sometimes\xa0in large amounts\xa0and\xa0often in the\xa0form\xa0of\xa0Liesegang\xa0rings.\nThis calcification actually appears to occur in some instances in globules of the amyloid-like material, many of which have coalesced and are transformed from being PAS (periodic acid-Schiff)-negative to PAS-positive during this calcification process. There does not appear to be necessarily a relationship between the amount of amyloid material formed in a given lesion and the amount of calcification occurring.', 'role': 'assistant'}]