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: Surgery
[{'content': 'Raju, a 10 yrs old child, presents with predisposition to fractures, anemia, hepatosplenomegaly and a diffusely increased radiographic density of bones. The most likely diagnosis is: \nSelect and explain. \nA. Osteogenesis imperfecta, B. Pycnodysostosis, C. Myelofibrosis, D. Osteopetrosis', 'role': 'user'}, {'content': "Answer: D \nExplanation: The above clinical scenario gives the diagnosis of osteopetrosis. Ref: Harrison's Principles of Internal Medicine, 15th Edition, Page 2240", 'role': 'assistant'}]