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
Watson Jones operation is done for: 
Select and explain. 
A. Polio, B. Muscle paralysis, C. Neglected clubfoot, D. Chronic ankle instability.
D: Chronic ankle instability.
Answer: D: Chronic ankle instability. 
Explanation: D. i.e. Chronic ankle instability Smith-Peterson anterolateral approach; Watson Jones, Harding's, Harris lateral approach; Moore's posterior approach of hip joint are used for hip surgeries. Chronic ankle instability can be satisfactorily treated by Was ton- Jones operationQ. Watson- Jones is also a lateral approach to the hip joint, which can be used for hip replacement (although rarely as more commonly used approaches are Moore's posterior and Hardinge's antero-lateral approach.