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: Physiology
[{'content': 'The blood pressure measured by a sphygmomanometer \nSelect and explain. \nA. Is lower than the intraaerial pressure, B. Is higher than the intraaerial pressure, C. Is same as the intraaerial pressure, D. Is the same with different cuff sizes', 'role': 'user'}, {'content': 'Answer: B \nExplanation: At the point at which systolic pressure in the aery just exceeds the cuff pressure, a spu of blood passes through with each heabeat and, synchronously with each beat, a tapping sound is heard below the cuff.Ref: Ganong&;s Review of Medical Physiology 25th Edition. Page: 577', 'role': 'assistant'}]