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
Cupping of optic disc is seen in: March 2004 
Select and explain. 
A. Trachoma, B. Open angle glaucoma, C. Retinitis pigmentosa, D. Retinoblastoma
B: Open angle glaucoma
Answer: B: Open angle glaucoma 
Explanation: Ans. B i.e. Open angle glaucoma