This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ohopedics Oncology, Subject name: Orthopaedics
[{'content': 'Which of the following lesion is least likely to be eccentric? \nSelect and explain. \nA. GCT, B. Simple bone cyst, C. Osteochondroma, D. Aneurysmal bone cyst', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Simple Bone cyst is seen in metaphysis or in diaphysis and it can be least likely to be at an eccentric location. Aneurysmal bone cyst is the lesion most likely to occur in ecentric location. All other lesions might sta from centre but ultimately during presentation,they present as eccentric lesion.', 'role': 'assistant'}]