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
Night blindness mainly occurs due to interference with the functions of rods owing to deficiency of visual purple. All of the following are causes of night blindness, EXCEPT: 
Select and explain. 
A. Vitamin A deficiency, B. High myopia, C. Eales disease, D. None of the above
C: Eales disease
Answer: C: Eales disease 
Explanation: Poor or feeble vision in twilight or in night is known as night blindness or nyctalopia. Causes of night blindness: Xerophthalmia Retinitis pigmentosa High myopia Advanced open-angle glaucoma Disseminated chorioretinal atrophy Oguchi's disease Congenital night blindness Ref: Textbook of Ophthalmology By H V Nema, Nitin Nema, 2012, Page 346.