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
[{'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: A i.e. Abduction & lateral rotation The movement most commonly affected in greater tuberosity fracture is external rotation in abductionQ This is very obvious because the muscles inseed in greater tuberosity of humerus & their actions are as following.', 'role': 'assistant'}]