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
Bohler's angle is measured in the fractures involving which of the tarsel bones? 
Select and explain. 
A. Calcaneum, B. Talus, C. Navicular, D. Cuboid
A: Calcaneum
Answer: A: Calcaneum 
Explanation: 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.