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': 'An 18 year old male presents to OPD with pain in lower right tooth region with no remarkable medical history. On intraoral examination, teeth are not carious and respond normally to vitality test. Radiographic examination reveals well-defined multilocular radiolucency with scalloping around the root of 43. What is the most probable diagnosis? \nSelect and explain. \nA. Dentigerous cyst, B. Stafne bone cyst, C. Simple bone cyst, D. Residual cyst', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Simple bone cyst are very common. Most occur in the first 2 decades of life, with a mean age of 17 years. The lesion shows a male predominance\xa0 of\xa0 approximately\xa0 2 : 1.\xa0 Multiple\xa0 SBCs\xa0 can\xa0 develop,\xa0especially\xa0when\xa0the\xa0disorder\xa0occurs\xa0with\xa0cemento-osseous\xa0dysplasia. The occurrence of SBCs in cemento-osseous dysplasia is seen in an older population, with a mean age of 42 years, and with a female predominance of 4 : 1. SBCs are asymptomatic in most cases, but occasionally pain or tenderness may be present, especially if the cyst has become secondarily infected. Expansion of the mandible or\xa0tooth\xa0movement\xa0is\xa0possible\xa0but\xa0unusual.\xa0The\xa0teeth\xa0in\xa0the affected region usually are vital. Most SBCs are discovered\xa0 by chance, during radiographic examinations, and for this reason they can become quite large. There is no significant incidence of pathologic fractures. Aspiration usually produces only a few milliliters of straw-colored or serosanguineous fluid.\nOral Radiology, Principles and Interpretation / Stuart C. White, Michael J. Pharoah - 7th ed pg-354', 'role': 'assistant'}]