This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Which of  the following is not the Boundary of triangle of safety \nSelect and explain. \nA. Anterior axial fold, B. Posterior axial fold, C. 5th intercoastal space, D. None of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]