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: Radiology
[{'content': '"Champagne Glass" pelvis is seen in: \nSelect and explain. \nA. Achondroplasia, B. Cretinism, C. Down\'s syndrome, D. Congenital dislocation of hip', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Achondroplasia', 'role': 'assistant'}]