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
Lumbar canal stenosis presents as ? 
Select and explain. 
A. Claudication, B. Scoliotic deformity, C. Kyphotic deformity, D. Radiculopathy
A: Claudication
Answer: A: Claudication 
Explanation: Ans. is 'a' i.e., Claudication The patient of lumbar canal stenosis is usually a man aged over 50, complains of aching, heaviness, numbness and paraesthesia in the thighs and legs; it comes on after standing upright or walking for 5-10 minutes, and is consistently relieved by sitting, squatting or leaning against a wall to flex the spine (hence the term 'spinal claudication').