This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Injuries Around the Fore Arm & Wrist, Subject name: Orthopaedics
[{'content': "Diagnose the condition in the given x -ray \nSelect and explain. \nA. Colie's fracture, B. Monteggia fracture, C. Galeazzi fracture, D. Gun stock fracture", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is \'b\' i.e., Monteggia fracture * This is the fracture of upper third of ulna with dislocation of the radial head. It is usually called "tracherous lesion" because the dislocation is often missed - monteggia fracture.', 'role': 'assistant'}]