This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cerebrovascular, Subject name: Medicine
[{'content': 'Most common cause of embolic stroke is - \nSelect and explain. \nA. Intra-Cardiac Thrombi, B. Particulate matter from IV drug injections, C. Protein C deficiency, D. Antiphospholipid syndrome', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Intra-Cardiac Thrombi o The most common cause of embolic strokes are Intra-cardiac Thrombi.o The most common sources of systemic embolism and embolic stroke are Intra-cardiac thrombiformed as a result of atrial fibrillation, ST-elevation Ml, left ventricular dysfunction or heart failure.", 'role': 'assistant'}]