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: Orthopaedics
[{'content': 'Raju, a 10 yr old child, presents with a predisposition to fractures, anaemia, hepatosplenomegaly and a diffusely increased radiographic density of bones. The most likely diagnosis is - \nSelect and explain. \nA. Osteogensis imperfecta, B. Pyknodysostosis, C. Myelofibrosis, D. Osteopetrosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Osteopetrosis is characterized by progressive anemia, hepatosplenomegaly, severe infections, pathological fractures and diffusely sclerotic bone.', 'role': 'assistant'}]