This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral Vascular Disease, Subject name: Medicine
[{'content': 'Most common source of systemic emboli is: \nSelect and explain. \nA. Varicose veins, B. Mural thrombi, C. Cardiac thrombi, D. Pulmonary embolism', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans: B (Mural thrombi) Ref: Kumar & Robbin, Pg 91Explanation:Systemic Thromboembolism80% from cardiac mural thromboembolism75% of it is from LV infarcts25% with dilated LAAortic aneurysm, atherosclerotic plaque, valvular vegetations, paradoxical embolismCommon arterial embolisation sites- Lower extremities (75%), CNS (10%), intestines, kidneys and spleenPulmonary thromboembolism occurs most commonly from DVT', 'role': 'assistant'}]