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
[{'content': 'Dark adaptation is delayed in all of the following conditions except: \nSelect and explain. \nA. Pigmentary retinal dystrophy, B. Vitamin A deficiency, C. Primary open-angle glaucoma, D. Heredomacular degeneration', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. Heredomacular degeneration', 'role': 'assistant'}]