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: Medicine
Most common cause of embolic stroke is 
Select and explain. 
A. Intra-Cardiac Thrombi, B. Paiculate matter from IV drug injections, C. Protein C deficiency, D. Antiphospholipid syndrome
A: Intra-Cardiac Thrombi
Answer: A: Intra-Cardiac Thrombi 
Explanation: 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.