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': "Schober test is used in \nSelect and explain. \nA. Rheumatoid Arthritis, B. Ankylosing spondilitis, C. Reiter's syndrome, D. Enteropathic arthritis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]