This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
[{'content': 'Mizuo phenomenon is seen in \nSelect and explain. \nA. Oguchi disease, B. Stargardt disease, C. Gyrate atrophy, D. Retinitis pigmentosa', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Oguchi disease also called as congenital stationary night blindness * Mizuo- nakamura phenomenon: Patient sees better in dark than during day. * Genetic: AR, Mutation in rhodopsin kinase gene * Fundus is normal in dark but loses its sheen in day light * Delayed dark adaptation time * Cause: impaired rods activity (overstimulation of rod cells)', 'role': 'assistant'}]