This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Lens), Subject name: Ophthalmology
Lens nuclear degeneration is yellow color because of- 
Select and explain. 
A. Lipofuscin, B. Urochrome, C. Lipochrome, D. Bilirubin
B: Urochrome
Answer: B: Urochrome 
Explanation: Ans. is lb' i.e., Urochrome "Nuclear sclerosis also distorts color vision because of -yellow -brown urochrome pigment, which accumulates in the lens and filters out blue wavelengths of light".-- Eye pathologyo Older nuclear cells lose organelles and cell membranes, with increasing density and dehydration and accumulation of yellow urochrome pigment (possible photo-oxidation product),o Pathology shows homogeneity of nucleus , with loss of cellular lamination and increased eosinophilia.o When advanced, it becomes brown (brunescent) or black (cataracta nigra).