This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pathology
[{'content': 'What does "cardiac polyp" mean? \nSelect and explain. \nA. Acute infarct, B. Cardiac aneurysm, C. Benign tumor, D. Fibrinous clot', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A pedunculated tumor attached to the inside of the hea. If situated close to a valve, it may cause blockage of the valve intermittently. Robbins 8 th edition page no. 384', 'role': 'assistant'}]