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': 'Following statement regarding dislocation of shoulder are true except; \nSelect and explain. \nA. Head of humerus usually dislocates forward from shoulder joint, B. Injury is produced by forced extension & external rotation of abducted arm, C. In posterior dislocation, appearance of shoulder is not normal, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. In posterior dislocation, appearance of shoulder is not normal', 'role': 'assistant'}]