This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acute coronary syndrome, Subject name: Medicine
In ECG lead II, III, and aVF are abnormal. Which of the following vessel is blocked? 
Select and explain. 
A. Left coronary aery, B. Left anterior descending, C. Right coronary aery, D. Right circumflex aery
C: Right coronary aery
Answer: C: Right coronary aery 
Explanation: Leads II, III, and aVF detect Inferior wall ischemia. Inferior wall of hea is formed mainly by the major pa of right ventricle and left ventricles separated by the posterior interventricular groove, which is mainly supplied by the right coronary aery. Any block in RCA results in inferior wall and posterior 1/3rd of interventricular septum MI.