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': 'Features of cleidocranial dysplasia: \nSelect and explain. \nA. Clavicle is small or absent., B. Wormian bones are present., C. Air sinuses are absent., D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]