This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Arrhythmias, Subject name: Medicine
[{'content': 'Blood pressure is difficult to measure in a patient with- \nSelect and explain. \nA. Mitral stenosis, B. Aortic stenosis, C. Complete heart block, D. Atrial fibrillation', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e.. Atrial fibrillation o Since patients of atrial fibrillation have an irregularly irregidar pulse the routine oscillo-metric de\\>ices would falter on BP measurement and hence the N.I.C.E. (British HTN guidelines) advise the auscultatory> method only.", 'role': 'assistant'}]