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
Argyll Robeson pupil is commonly seen in: March 2013 
Select and explain. 
A. Retinitis pigmentosa, B. Diabetic retinopathy, C. Encephalitis, D. Neurosyphilis
D: Neurosyphilis
Answer: D: Neurosyphilis 
Explanation: Ans. D i.e. Neurosyphilis