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
Which of the following is known for Non union in children, if left untreated? 
Select and explain. 
A. lntercondylar fracture of humerus, B. Fracture shaft of humerus, C. Fracture shaft of femur, D. Fracture distal 1/3rd of tibia
B: Fracture shaft of humerus
Answer: B: Fracture shaft of humerus 
Explanation: B i.e. Fracture of shaft humerus