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
True about boundary of triangle of auscultation is ? 
Select and explain. 
A. Lateral boundary by latissimus dorsi, B. Medial boundary by scapula, C. Lateral boundary by latissimus dorsi, D. Medial boundary by trapezius
D: Medial boundary by trapezius
Answer: D: Medial boundary by trapezius 
Explanation: Triangle of auscultationIt is a small triangular space on the back, near inferior angle of scapula, where the relatively thin musculature allows for respiratory sounds to be heard more clearly with a stethoscope. The sounds of swallowed fluids can be sometimes heard in esophageal obstruction as cardiac orifice of stomach lies deep to this triangle. It is formed byMedially : Lateral border of trapeziusLaterally : Medial border of scapulaInferiorly : Upper border of latissimus dorsiFloor is formed by : 6th and 7th rib with intercostal space between them, rhomboideus major.Apex of lower lobe of both lungs lie beneath this triangle.