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': 'Popliteal aery pulsations are difficult to feel because \nSelect and explain. \nA. It is not superficial, B. It does not cross prominent bone, C. It is not superficial and does not cross prominent bone, D. Its pulsation are weak', 'role': 'user'}, {'content': "Answer: C \nExplanation: Popliteal aery is difficult to feel.It is palpated better in prone position with knee flexed about 40-50 degree,to relax the popliteal fascia.It is felt in the lower pa of the fossa over the flat posterior surface of upper end of tibia.In upper end of the fossa,aery is not felt as there is no bony area in intercondylar region. Refer page no173 of SRB's manual of surgery 5 th edition.", 'role': 'assistant'}]