What test is used to determine if a previous chest pain was angina or myocardial infarction?

To determine if past chest pain was ANGINA (reversible ischemia) or was CARDIAC in nature, a STRESS TEST (Exercise Treadmill Test / Stress ECG) is used. It assesses cardiac response to exercise stress — ST changes indicate ischemia. For ACUTE MI diagnosis, troponin is used (elevated in MI). For CHRONIC evaluation of suspected angina vs. MI history, the stress test evaluates coronary artery disease severity. Angiogram is more invasive (gold standard for CAD anatomy). B is correct for this clinical scenario.