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': "Cobb's angle is used to measure the degree of \nSelect and explain. \nA. Kyphoscoliosis, B. Angular deformity of the knee, C. Extent of depression in calcaneal fracture, D. Extent of spondylolistheis", 'role': 'user'}, {'content': "Answer: A \nExplanation: (Refer: Mohindra's Fundamentals of Ohopedics, 2nd edition, pg no. 244, 245)", 'role': 'assistant'}]