Polychromatic lusture is seen in-: (A) Complicated cataract, (B) Diabetes mellitus, (C) Post radiation cataract, (D) Congenital cataract
Answer is A. In complicated cataract 'polychromatic luster'ie., appearance of iridescent coloured paicles of reds, greens and blue is a very characteristic sign (Rainbow cataract). IMG REF