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: Pathology
[{'content': 'Most common site of eosinophilic granuloma - \nSelect and explain. \nA. Radius, B. Femur, C. Skull, D. Lumbar vertebrae', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]