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
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: 
Select and explain. 
A. Osteogenesis imperfecta, B. Pycnodysostosis, C. Myelofibrosis, D. Osteopetrosis
D: Osteopetrosis
Answer: D: Osteopetrosis 
Explanation: The above clinical scenario gives the diagnosis of osteopetrosis. Ref: Harrison's Principles of Internal Medicine, 15th Edition, Page 2240