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': 'Codfish veebrae are seen in: March 2004 \nSelect and explain. \nA. Osteopetrosis, B. Osteoporosis, C. Morquis syndrome, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Osteoporosis', 'role': 'assistant'}]