This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal system, Subject name: Radiology
[{'content': "Champagne glass pelvis is seen in - \nSelect and explain. \nA. CDH, B. Down's syndrome, C. Cretinism, D. Achondroplasia", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Radiological features of Achondroplasia : Macrocephaly. Frontal bossing J shaped sella Caudal narrowing of interpedicular distance Champagne glass pelvis Trident hand', 'role': 'assistant'}]