This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Congenital Dislocation of Hip (C.D.H.), Subject name: Orthopaedics
[{'content': '60 degree angle of Z plasty causes how much increase in length? \nSelect and explain. \nA. 25%, B. 50%, C. 75%, D. 100%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: (c) 75%ExplanationZ plasty--relationship between angle of Z plasty and elongation:- 30degrees--25%elongation- 45degrees--50%elongation- 60degrees--75%elongation- 75degrees--100%elongation- 90degrees--125%elongation', 'role': 'assistant'}]