This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Orthopaedics
[{'content': 'True regarding Monteggia fracture is: \nSelect and explain. \nA. Upper ulnar fracture & dislocated radial head, B. Upper radial fracture & dislocated ulna, C. Lower radial fracture & dislocated ulna, D. Lower ulnar fracture & dislocated radius', 'role': 'user'}, {'content': 'Answer: A \nExplanation: : Upper ulnar fracture & dislocated radial head Monteggia fracture-dislocations are classified by the Bado system Bado type I injuries are characterized by a proximal ulnar fracture with anterior dislocation of the radial head. This is due to a forceful pronation injury of the forearm and is the most common type. Bado type II injuries are "reversed" Monteggia fracture-dislocation injuries. Here, there is posterior angulation of the ulnar fracture site and posterior dislocation of the radial head. Bado type III and IV are rare injuries. REF : Maheshwari book of ohopedics 6th Ed.', 'role': 'assistant'}]