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': 'Underdeveloped maxilla is seen in all except: \nSelect and explain. \nA. Cleidocranial dysplasia., B. Treacher collins syndrome., C. Osteogenesis imperfecta., D. Achondroplasia.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]