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: Pathology
[{'content': 'An embolus which passes through an arteriovenous communication and enters the systemic circulation is called? \nSelect and explain. \nA. Paradoxical embolus, B. Retrograde embolus, C. Saddle embolus, D. Atheroembolus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Rarely, an embolus passes through an atrial or\xa0ventricular defect and enters the\xa0systemic circulation called paradoxical embolism.\nPulmonary Embolus can occlude the main pulmonary artery, lodge at the bifurcation of the right and left pulmonary arteries called saddle embolus.\nRobin’s Textbook of pathology 10th ed Page 112', 'role': 'assistant'}]