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
[{'content': 'Z-plasty ideal angle is \nSelect and explain. \nA. 30 degrees, B. 45 degrfees, C. 60 degrees, D. 90 degrees', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Z-plasty is a plastic surgery technique used to improve the functional and cosmetic appearance of scars. It involves the creation of two triangular flaps of equal dimension that are then transposed. For a basic z-plasty, the triangular flaps are created using an angle of 60 degrees Theoretically, this angle can lengthen a contracted scar by about 75 percent and reorient the direction of the central wound by 90 degrees.', 'role': 'assistant'}]