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. Latissimus dorsi, C. Trapezius, D. Scapula', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Boundaries of triangle of auscultation:Medially by trapeziusLaterally by scapula and rhomboid majorInferiorly by latissimus dorsiThis triangle allows lung sounds to be clearly heard at 6th intercostal space because no muscle intervenes between skin and rib cage when shoulders are pulled forward.', 'role': 'assistant'}]