This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal Radiology, Subject name: Radiology
[{'content': "A 13-year-old male is brought to the ER after injuring his forearm. He fell onto his palm and noted pain and a deformity in his forearm. Examination revealed normal vital signs and findings limited to his left arm. His clavicle, shoulder, humerus, and hand were non-tender. He was reluctant to move his shoulder since his forearm was in a splint and sling. There was an obvious angulation at the mid-forearm. He could move all his fingers. No circulatory or sensory deficits were detected.X-rays of his forearm are obtained. The most likely diagnosis is? \nSelect and explain. \nA. Galeazzi's fracture, B. Night-stick fracture, C. Monteggia's fracture, D. Cole's fracture", 'role': 'user'}, {'content': "Answer: A \nExplanation: Galeazzi fracture-dislocation: Fracture of the distal third of the radius with dislocation of the distal radio-ulnar joint Monteggia fracture-dislocation: Fracture of the proximal third of the ulna, with dislocation of the head of the radius. Night-stick fracture: Isolated fracture of the shaft of the ulna, sustained while trying to ward off a stick blow. Colies' fracture: A fracture occurring in adults, at the coico-cancellous junction of the distal end of the radius with dorsal tilt and other displacements.", 'role': 'assistant'}]