<prompt> Most common cause of embolic stroke isIntra-Cardiac ThrombiPaiculate matter from IV drug injectionsProtein C deficiencyAntiphospholipid syndrome  <response>: Ans. is a i.e., Intra-Cardiac Thrombi The most common cause of embolic strokes are Intra-cardiac Thrombi. The most common sources of systemic embolism and embolic stroke are Intra-cardiac thrombi formed as a result of atrial fibrillation, ST-elevation MI, left ventricular dysfunction or hea failure. 