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': 'On a routine radiographic exam, a well-defined radiolucent lesion was seen in the body of the mandible of a 17-year-old boy. At the time of operation, it proved to be an empty cavity. This is a(an) _____. \nSelect and explain. \nA. Osteoporotic bone marrow, B. Aneurysmal bone cyst, C. Odontogenic keratocyst, D. Traumatic bone cyst', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Traumatic bone cysts characteristically occur in the body of the mandible of teenagers. They are pseudocysts in that they have no epithelial lining. They are empty cavities.', 'role': 'assistant'}]