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': 'The radiograph of a 32 year old patient is shown below. The patient is asymptomatic and the lesion revealed in the\xa0radiograph is an accidental finding. The most likely diagnosis is: \nSelect and explain. \nA. Stafne’s bone cavity, B. Radicular Cyst, C. Dentigerous cyst, D. Lateral periodontal cyst', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Radiological signs:\nThe lesion presents as a chance radiographic finding. It is a round or an ovoid (<3 cm) uniform radiolucency with a well-defined, usually corticated, margin. Stafne’s bone cavity is non-expansile and is found below the mandibular canal just anterior to the angle of the mandible. The location of Stafne’s bone cavity distinguishes it from odontogenic lesions, whose origin is within the alveolar bone.', 'role': 'assistant'}]