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
[{'content': 'Which of the following is false regarding coronary circulation ? \nSelect and explain. \nA. Anterior 2/3 of septum is supplied by LCA, B. Posterior 1/3 of septum is supplied by RCA, C. Right bundle branch is supplied by RCA, D. Left bundle branch is supplied by LCA', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Right coronary aery supplies (i) SA node (in 65%), (ii) whole conducting system (AV bundle, bundle of his, pa of left bundle branch) except RBB and pa of left branch of AV bundle, (iii) posterior pa of ventricular septum, (iv) most of right ventricle except small pa adjoining anterior interventricular groove and small pa of left ventricle adjoining posterior interventricular groove.Left coronary aery supplies (i) most of the left atrium, (ii) most of the left ventricle including apex, (iii) small pa of right ventricle odjoining anterior interventricular septum, (iv) anterior 2/3 of ventricular septum, (v) RBB, LBB and (vi) SA node in 35% of cases.', 'role': 'assistant'}]