This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Shoulder and arm injuries, Subject name: Orthopaedics
[{'content': 'Closed pinning techinque in oopedic surgeries is not done in \nSelect and explain. \nA. Neck of humerus fracture, B. Shaft of humerus fracture, C. Distal radius fracture, D. Supracondylar fracture of humerus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The technique of percutaneous pinning and and casts seems capable of restoring joint function for simple extra aicular and intra aicular fractures above image showed shaft of humerus fracture fixed with plate and pin fixation . not pin fixation alone ref : maheswari 9th ed', 'role': 'assistant'}]