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
Ring scotoma is seen in –a) Retinitis pigmentosa b) Glaucomac) Cataractd) Retinal detachment 
Select and explain. 
A. ab, B. a, C. ad, D. bc
A: ab
Answer: A: ab 
Explanation: Ring scotoma is seen in retinitis pigmentosa, high myopia, POAG, aphakic spectacle correction and after panretinal photocoagulation.