This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
Blood supply of ventral 2/3rd of interventricular septum of hea is 
Select and explain. 
A. Right coronary aery, B. Left coronary aery, C. Posterior interventricular aery, D. Marginal aery
B: Left coronary aery
Answer: B: Left coronary aery 
Explanation: The posterior interventricular aery, a branch of right coronary aery, supplies the posterior 1/3 of the interventricular septum. The remaining anterior 2/3 is supplied by the anterior interventricular aery which is a septal branch of the left anterior descending aery, which is a branch of left coronary aery . B D CHAURASIA'S HUMAN ANATOMY UPPER LIMB THORAX-VOLUME-1 SIXTH EDITION Page-265