This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Orthopaedics
[{'content': 'Lumbar canal stenosis presents as \nSelect and explain. \nA. Claudication, B. Scoliotic deformity, C. Kyphotic deformity, D. Radiculopathy', 'role': 'user'}, {'content': "Answer: A \nExplanation: The patient of lumbar canal stenosis is usually a man aged over 50, complains of aching, heaviness, numbness an 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')(Refer: Mohindra's Fundamentals of Ohopedics, 2nd edition, pg no. 241)", 'role': 'assistant'}]