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': "A 30-year-old male presented with hip pain for last 6 months. Hip X-ray is as shown below. What is the likely diagnosis? \nSelect and explain. \nA. Giant cell tumor, B. Simple Bone Cyst, C. Adamantinoma, D. Ewing's sarcoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Radiographic findings often are diagnostic. The characteristic x ray findings of GCT are: Eccentric Expansile Lobulated Lytic Metaphyseal NO matrix calcification of periosteal new bone formation', 'role': 'assistant'}]