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
[{'content': "Giant 'V' wave on examination of the jugular venous pulse is suggestive of - \nSelect and explain. \nA. Atrial flutter with changing block, B. Tricuspid incompetence, C. Ventricular septal defect, D. Pulmonary stenosis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]