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
Schober test is used in 
Select and explain. 
A. Rheumatoid Arthritis, B. Ankylosing spondilitis, C. Reiter's syndrome, D. Enteropathic arthritis
B: Ankylosing spondilitis
Answer: B: Ankylosing spondilitis 
Explanation: None