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: Anatomy
[{'content': 'Which of the following does not form a boundary of the triangle of auscultation: \nSelect and explain. \nA. Serratus anterior, B. Latissimusdorsi, C. Trapezius, D. Scapula', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Serratus anterior', 'role': 'assistant'}]