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': 'Nasal stiffness, pan cytopenia, hypertelorisn is seen in : \nSelect and explain. \nA. Osteoporosis ., B. Fibrous dyplasis., C. Marfan syndrome., D. Apert syndrome.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]