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
"Marble Bone" appearance is seen in: March 2009 
Select and explain. 
A. Osteomalacia, B. Osteopetrosis, C. Rickets, D. Osteoporosis
B: Osteopetrosis
Answer: B: Osteopetrosis 
Explanation: Ans. B: Osteopetrosis Osteopetrosis/marble bone disease/Albers-Schonberg disease is a disorder characterized by dense but brittle bones (marble bones)