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
Mizuo phenomenon is seen in 
Select and explain. 
A. Oguchi disease, B. Stargardt disease, C. Gyrate atrophy, D. Retinitis pigmentosa
A: Oguchi disease
Answer: A: Oguchi disease 
Explanation: 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)