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
Acquired blue blindness is a feature of: 
Select and explain. 
A. Increased sclerosis of the crystalline lens, B. Disease of optic nerve, C. Disease of macula, D. All of the above
A: Increased sclerosis of the crystalline lens
Answer: A: Increased sclerosis of the crystalline lens 
Explanation: Ans. Increased sclerosis of the crystalline lens