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: Radiology
[{'content': "'H' shaped veebra is seen in: \nSelect and explain. \nA. Phenylketonuria, B. Sickle cell anemia, C. Hemangioma, D. Osteoporosis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Sickle cell anemia', 'role': 'assistant'}]