This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
Maximum lengthening is obtained if the angle of Z plasty is ? 
Select and explain. 
A. 30 degrees, B. 45 degrees, C. 60 degrees, D. 90 degrees
D: 90 degrees
Answer: D: 90 degrees 
Explanation: .larger angle provides more lengthening but is difficult to close due to skin tension