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
Which of the following structure forms the medial border of Hesselbach's triangle? 
Select and explain. 
A. Linea alba, B. Linea semilunaris, C. Inferior epigastric aery, D. Conjoint tendon
B: Linea semilunaris
Answer: B: Linea semilunaris 
Explanation: Boundaries of Hasselbach's triangle:Medial border: Lateral margin the rectus sheath, also called linea semilunaris.Superolateral border: Inferior epigastric aery.Inferior border: Inguinal ligament, sometimes Referred to as Poupa's ligament.