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: Radiology
[{'content': 'A 30 year old male presents to the OPD with pain in lower right tooth region with no remarkable medical history. Extra-oral examination reveals hard swelling corresponding to ramus of the mandible. On intra-oral examination 48 is absent.  Aspiration reveals a thick, yellow cheesy material. OPG of patient is given below. What is the most probable diagnosis? \nSelect and explain. \nA. Hyperplastic follicle, B. KOT, C. Adenomatoid  odontogenic  tumor, D. Dentigerous cyst', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Clinical Features\nKOTs usually have no symptoms, although mild swelling may occur. Pain may occur\xa0 with\xa0 secondary\xa0 infection.\xa0 Aspiration\xa0 may\xa0 reveal\xa0 a\xa0 thick,yellow, cheesy material (keratin). In contrast to cysts, KOTs have a high propensity for recurrence, possibly because of small satellite cysts or fragments of epithelium left behind after surgical removal of the cyst.\nDifferential Diagnosis\nWhen in a pericoronal position, a KOT may be indistinguishable from a dentigerous cyst. The lesion is likely to be a KOT if the\xa0cystic outline is connected to the tooth at a point apical to the cementoenamel junction or if no expansion of the cortical plates has occurred. Also, although KOTs can develop occlusal to developing teeth, often the follicle of the involved tooth is not enlarged as in dentigerous cysts. The typical scalloped margin and multilocular appearance of the KOT may resemble an ameloblastoma, but\xa0 the\xa0latter\xa0has\xa0a\xa0greater\xa0propensity\xa0to\xa0expand.\xa0\nRadiographic interpretation-\nAs with cysts, KOTs usually show evidence of a cortical border, unless they have become secondarily infected.\nThe cyst may have a smooth, round or oval shape identical to that of other cysts, or it may have a scalloped outline (a series of contiguous arcs).\nOral Radiology, Principles and Interpretation / Stuart C. White, Michael J. Pharoah - 7th ed pg- -343', 'role': 'assistant'}]