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: Surgery
[{'content': "Bohler's angle is measured in the fractures involving which of the tarsel bones? \nSelect and explain. \nA. Calcaneum, B. Talus, C. Navicular, D. Cuboid", 'role': 'user'}, {'content': "Answer: A \nExplanation: Bohler's tuber joint angle and Crucial angle of Gissane are measured for intra aicular fractures of calcaneum. Ref: Apley's 8th Edition, Page 750, 751; Rockwood and Green 5th Edition, Page 2135; John Ebnezer 2nd Edition, Page 146.", 'role': 'assistant'}]