This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neuro-ophthalmology, Subject name: Ophthalmology
[{'content': 'Acquired blue blindness is a feature of \nSelect and explain. \nA. Disease of optic nerve, B. Disease of macula, C. Increased sclerosis of the crystalline lens, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Acquired Colour Blindness Acquired blue colour defect (blue blindness) : It may occur in old age due to increased sclerosis of the crystalline lens. It is owing to the physical absorption of the blue rays by the increased a.ambercoloured pigment in the nucleus. Ref:- A K KHURANA; pg num:-305', 'role': 'assistant'}]