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
[{'content': 'The following fractures are known for nonunion, EXCEPT: \nSelect and explain. \nA. Fracture lower half of tibia, B. Fracture of neck of femur, C. Fracture of scaphoid, D. Supracondylar fracture of humerus', 'role': 'user'}, {'content': "Answer: D \nExplanation: The distal humeral metaphysis (supracondylar area) is a well vascularized area with remarkably rapid healing and nonunion of a supracondylar fracture is extremely rare. Non union is almost never seen without infection (open wounds) and/ or extensive soft tissue devascularization. Ref: Tachdjian's Pediatric Ohopedics 3/e, Page 2130-75, 2060; Rockwood and Green's Fracture in Children 6/e, Page 543-86.", 'role': 'assistant'}]