This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2017, Subject name: Anatomy
Left anterior descending aery is a branch of 
Select and explain. 
A. Ascending aoa, B. Right coronary aery, C. Left coronary aery, D. Circumflex aery
C: Left coronary aery
Answer: C: Left coronary aery 
Explanation: Ascending aoa Right coronary aery Left coronary aery SA Nodal aery AV Nodal Aery Posterior Interventricular Aery (PIVA) Anterior Interventricular Aery (AIVA) OR Left anterior descending aery Circumflex Aery AIVA supplies the anterior 2/3rd of interventricular septum PIVA supplies the posterior 1/3rd of interventricular septum