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
[{'content': 'Which of the following incision used in diaphragm surgery is safest \nSelect and explain. \nA. Horizontal, B. Veical, C. Circumferential, D. Transverse', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Circumferential is the safest as it prevents injury to phrenic nerve to maintain the function of the diaphragm', 'role': 'assistant'}]