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
You have been referred a middle-aged patient to rule out open angle glaucoma. Which of the following findings will help in the diagnosis: 
Select and explain. 
A. Cupping of the disc, B. Depth of anterior chamber, C. Visual acuity and refractive error, D. Angle of the anterior chamber
A: Cupping of the disc
Answer: A: Cupping of the disc 
Explanation: Appearance of cupping of disc will help for diagnosis. Ref: Textbook of Ophthalmology By Nema, 3rd Edition, Page 175