This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Blood pressure measured using a sphygmomanometer \nSelect and explain. \nA. May be falsely low with too narrow cuff, B. May be falsely low in patients with badly stiffened aeries, C. May be falsely high in obese patients, D. Gives a direct reading of mean aerial pressure', 'role': 'user'}, {'content': 'Answer: C \nExplanation: If the cuff is too small, it takes a falsely high pressure in the cuff to transmit sufficient pressure to the vessel wall for total occlusion of the aery.Blood pressure may be falsely high in patients with badly stiffened aeries because of the extra pressure needed to compress the aeries.', 'role': 'assistant'}]