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': 'Regarding BP apparatus all are true except: \nSelect and explain. \nA. Width of the cuff should be 20% more than the limb diameter, B. Width of the cuff should be 40% of the limb circumference, C. Length of the cuff should be adequate to encircle atleast 80%of the limb, D. Ratio of width and length of cuff is 1:4', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ratio between cuff width and length is 1:2', 'role': 'assistant'}]