This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hea Sounds, Subject name: Medicine
All of the following form boundaries of triangle of auscultation except? 
Select and explain. 
A. Trapezius, B. Latissmus dorsi, C. Scapula, D. Rhomboid major
D: Rhomboid major
Answer: D: Rhomboid major 
Explanation: Triangle of auscultation has the following boundaries: Superiorly and medially- Trapezius Inferiorly-Latissimus Dorsi Laterally-Scapula Floor -Serratus anterior, Erector spinae .Deep-Osseous poions of the 6th and 7th ribs ,internal ,external intercostal muscles. Typically, the Triangle of Auscultation is covered by the Scapula. To better expose the triangle and listen to respiratory sounds with a stethoscope, patients are asked to fold their arms across their chest, medially rotating the scapulae, while bending forward at the trunk, somewhat resembling a fetal position.