This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
A 42 year old smoker has developed an acute anterior wall myocardial infarction. The coronary angiogram done on him is likely to show an obstruction of the - 
Select and explain. 
A. Left anterior descending aery, B. Left posterior descending aery, C. Right coronary aery, D. Circumflex aery
A: Left anterior descending aery
Answer: A: Left anterior descending aery 
Explanation: Occlusion of the left anterior descending coronary aery (LAD) may cause infarction of the anterior wall of the left ventricle, manifested as precordial ST-segment elevations. Inferior ST-segment elevations due to occlusion of a LAD may reflect an ischemia of wrapped LAD aery . Ref Davidson 23rd edition pg444