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': 'Calcification of the interveebral disc is present in: \nSelect and explain. \nA. Maple syrup urine disease, B. Homocystinuria, C. Ankylosing spondylitis, D. Achondroplasia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Ankylosing spondylitis', 'role': 'assistant'}]