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: Surgery
Schober's sign is for: 
Select and explain. 
A. Flexion of lumbar spine, B. Chest expansion, C. Pain with motion of hip, D. Neck pain and stiffness
A: Flexion of lumbar spine
Answer: A: Flexion of lumbar spine 
Explanation: * Schober's test is measure of flexion on lumber spine * This test is done in ankylosing spondylitis