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
After falling from a height, a child lands on his fully outstretched hands. On examination there is pain and swelling over his right elbow. Give your probable diagnosis - 
Select and explain. 
A. Fracture olecranon, B. Post dislocation of elbow, C. Supra condylar fracture of humerus, D. Fracture both bones forearm
C: Supra condylar fracture of humerus
Answer: C: Supra condylar fracture of humerus 
Explanation: Pain and swelling in a child after falling on outstretched hands suggest the diagnosis of supracondylar humeral fracture, which is the most common elbow injury in children.
Colles fracture, posterior dislocation and olecranon fracture are uncommon in children.