This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fracture of the Humerus, Subject name: Orthopaedics
[{'content': 'A patient had met with an accident and he can not abduct his right arm and can not lift it. On examination tenderness felt near right upper arm. X-ray showed fracture surgical neck of humerus. Muscle that was paralyzed was: \nSelect and explain. \nA. Subscapularis, B. Supraspinatus, C. Infraspinatus, D. Teres major', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (b) SupraspinatusThe best answer here is deltoid (axillary nerve) since it is not mentioned, so we choose supraspinatus (suprascapular nerve).', 'role': 'assistant'}]