Cataract brunescens results due to deposition of -: (A) Copper, (B) Iron, (C) Silver, (D) Urochrome
Answer is D. In nuclear senile cataract, there may or may not be associated with deposition of pigment urochrome and/or melanin derived from amino acids in the lens.
Commonly observed pigmented nuclear cataracts are amber, brown (cataract brunescens) or black (cataract nigra) and rarely reddish(cataract Rubra) in colour.