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: Anatomy
[{'content': 'Popliteal artery is difficult to palpate because - \nSelect and explain. \nA. It is not superficial, B. Does not pass over prominent bony structure, C. Superficial but does not pass over prominent bony structure, D. Not superficial & does not pass over prominent bony structure', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]