This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
[{'content': "Angle formed by joining a line extended from fracture line of fracture neck to an arbitrary line depicting horizontal plane \nSelect and explain. \nA. Shenton's line, B. Pauwel's angle, C. Perkins line, D. Nelton's line", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]