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': 'A young adults presents with night blindness and tubular vision. On examination, intraocular pressure was observed to be 18 mm and the anterior segment was unremarkable. Fundoscopy showed attenuation of aerioles and waxy pallor of the optic disc with bony corpuscles like spicules of pigmentation in mid peripheral retina. Ring scotomas were observed on perimetry. Which of the following is the most likely diagnosis: \nSelect and explain. \nA. Pigmentary retinal dystrophy, B. Primary open angle glaucoma, C. Lattice degeneration of retina, D. Diabetic retinopathy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Pigmentary retinal dystrophy', 'role': 'assistant'}]