This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Surgery
Which of the following incision used in diaphragm surgery is safest 
Select and explain. 
A. Horizontal, B. Veical, C. Circumferential, D. Transverse
C: Circumferential
Answer: C: Circumferential 
Explanation: Circumferential is the safest as it prevents injury to phrenic nerve to maintain the function of the diaphragm