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': 'All are radiological features of sickle cell anemia except – a) Vertebra planab) Floating teethc) Bone infarctd) Marrow hyperplasiae) Secondary osteomyelitis \nSelect and explain. \nA. ac, B. a, C. ab, D. bc', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Bone infarct, marrow hyperplasia and secondary osteomyelitis occur in sickle cell anemia.', 'role': 'assistant'}]