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
Blood pressure is difficult to measure in a patient with- 
Select and explain. 
A. Mitral stenosis, B. Aortic stenosis, C. Complete heart block, D. Atrial fibrillation
D: Atrial fibrillation
Answer: D: Atrial fibrillation 
Explanation: 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.