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
Tension band wiring is indicated in fracture of which of the following ? 
Select and explain. 
A. Fracture humerus, B. Olecranon, C. Fracture tibia, D. Fracture spine
B: Olecranon
Answer: B: Olecranon 
Explanation: Tension band wiring is indicated in the treatment of two types of olecranon fracture. First type is a clean break with separation of the fragments, and second type is comminuted fracture of the olecranon with displced fragments. A crack in the olecranon without displacement is treated by immobilising the elbow in an above elbow plaster slab in 30 degrees of flexion.