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
The malunion of supracondylar fracture of the humerus most commonly leads to - 
Select and explain. 
A. Flexion deformity, B. Cubitus varus, C. Cubitus valgus, D. Extension deformity
B: Cubitus varus
Answer: B: Cubitus varus 
Explanation: Cubitus varus, also known as a "gunstock deformity", is the most common complication of supracondylar fracture humerus, due to malunion.