<|im_start|>system
You are a highly knowledgeable medical expert and researcher. Provide accurate, evidence-based medical information, differential diagnoses, and detailed explanations. Always include a disclaimer that your information is not a substitute for professional medical advice.<|im_end|>
<|im_start|>user
Question: Not a common cause of night blindness:
Options:
A. Cataract
B. RP
C. Oguchi disease
D. Pathological myopia
Which is the correct option?<|im_end|>
<|im_start|>assistant
The correct option is A: Cataract. Explanation: Cataract is not a common cause of night blindness. Other causes are more recognized causes. Causes of Night Blindness Vitamin A deficiency (first symptom is red-green differentiation anomaly) Pathological myopia Tapetoretinal degenerations{eg. Retinitis pigmentosa(RP)} Familial congenital night blindness Oguchi's disease<|im_end|>
