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': 'All of the following are features of Argyll Robeson pupil, EXCEPT: \nSelect and explain. \nA. There is no reaction to light, B. Accommodation reflex is intact, C. Pupils dilate very poorly to mydriatics, D. Vision of the affected eye is diminished', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Argyll Robeson pupil occur in neurosyphilis and is characterised by a lesion in the tectum. The lesion is in the region of the syln aqueduct when the fibers from the pretectal nucleus go to the Edinger Westphal nucleus. In this condition the vision of the affected eye is normal. Features: Vision of the affected eye is normal There is no reaction to light Accommodation reflex is intact because the fibers that mediate the pupillary near response lie ventral to the internuncial neurons that enter the Edinger Westphal nucleus. The pupils are miotic and irregular The pupils dilate very poorly with mydriatics Ref: Textbook of Ophthalmology edited by Sunita Agarwal PAGE 305.', 'role': 'assistant'}]