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
Dark adaptation is delayed in all of the following conditions except: 
Select and explain. 
A. Pigmentary retinal dystrophy, B. Vitamin A deficiency, C. Primary open-angle glaucoma, D. Heredomacular degeneration
D: Heredomacular degeneration
Answer: D: Heredomacular degeneration 
Explanation: Ans. Heredomacular degeneration