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': 'X-ray changes in acromegaly are all except: \nSelect and explain. \nA. Lengthened terminal phalanx, B. Widened joint spaces, C. Obtuse angle of mandible and lengthening of mandible, D. Premature osteoahritis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Lengthened terminal phalanx', 'role': 'assistant'}]