This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Humerus Fractures, Subject name: Orthopaedics
Tardy Ulnar nerve palsy may be seen after all except- 
Select and explain. 
A. Malunited lateral condyle humerus fracture, B. Cubitus Varus due to malunited supracondylar fracture of the humerus, C. Old neglected elbow dislocation presenting with cubitus valgus, D. Fracture midshaft ulna
D: Fracture midshaft ulna
Answer: D: Fracture midshaft ulna 
Explanation: Ans. is 'd' i.e., Fracture midshaft ulna Causes of tardy ulnar nerve palsyi) Malunited lateral condyle humerus fracture (cubitus valgus)ii) Displaced medial epicondyle humerus fractureiii) Cubitus varus deformity (due to supracondylar fracture humerus)iv) Elbow dislocationv) Contusions of ulnar nervevi) Shallow ulnar groovevii) Hypoplasia of humeral trochleaviii) Joint deformity after prolonged arthritis of elbow