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: Orthopaedics
[{'content': 'Which of the following movements will be affected if the greater tubercle of the humerus is lost - \nSelect and explain. \nA. Abduction and lateral rotation, B. Adduction and flexion, C. Adduction and medial rotation, D. Flexion and medial rotation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Muscles attached to greater tuberosity are.\n\n\nSupraspinatus: - Helps in the initial range of abduction.\nInfraspinatous, Teres minor : - External (lateral) rotation.\n\n\nTherefore, these movements are affected in fracture greater tuberosity.\nMuscle attached to lesser tuberosity is subscapularis (an internal or medial rotator of shoulder joint). So, movement affected in lesser tuberosity fracture is an internal rotation.', 'role': 'assistant'}]