This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy and physiology of bone and fracture healing, Subject name: Orthopaedics
[{'content': 'Circumduction test is used for \nSelect and explain. \nA. Anterior shoulder instability, B. Posterior shoulder instability, C. Inferior shoulder instability, D. Either of above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref : essential ohopaedic maheshwari 9th ed', 'role': 'assistant'}]