This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteology, Subject name: Pathology
[{'content': 'X Ray shows lytic lesion in calceneus in young adult. Biopsy shows following diagnosis \nSelect and explain. \nA. Pigmented viilonodular synovitis, B. Ochronosis, C. Osteomylitis, D. Eumycosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Pigmented viilonodular synovitisImage shows hyperplasia of synomin along with hemosiderin laden macrophages and giant cells s/o Pigmented viilonodular synovitis.', 'role': 'assistant'}]