This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
[{'content': 'The normal ankle brachial pressure index (ABPI) is 1.0.A value of 0.8 suggests \nSelect and explain. \nA. Good flow, B. Some degree of alterial obstruction, C. Impending gangrene, D. Presence of collaterals', 'role': 'user'}, {'content': "Answer: B \nExplanation: . The normal value of Ankle Brachial Pressure index (ABPI) will be less than 0.3.one should check blood pressure in all the 4 limbs.ABPI is checked in supine position;systolic blood pressure in upper and lower limbs is checked and higher value of each extremities is taken;ABPI is calculated.Results->0.9 is normal ;.70-0.89 is mild disease; 0.50-0.69 is moderate;< 0.50 is severe. Refer page no 171 of SRB's manual of surgery 5 th edition.", 'role': 'assistant'}]