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
The boundary of the triangle of auscultation is not formed by 
Select and explain. 
A. Serratus anterior, B. Scapula, C. Trapezius, D. Latissimus dorsi
A: Serratus anterior
Answer: A: Serratus anterior 
Explanation: Triangle of auscultation is bounded medially by the lateral border of the trapezius, laterally by scapula and inferiorly by lattismus dorsi