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: Orthopaedics
[{'content': "A short statured patient brought with X-ray showing flattening of vertebrae with beak \nSelect and explain. \nA. Achondroplasia, B. Protein Energy malnutrition, C. Rickets, D. Down's syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]