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: Ophthalmology
[{'content': 'Which is of the following is not a feature of papilledema? \nSelect and explain. \nA. Deep physiological cupping, B. Absent venous pulsations, C. Bending of blood vessels, D. Decreased visual acuity', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Papilledema is associated with obliteration of the physiological cup and apparent edema of the disc.', 'role': 'assistant'}]