This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
Polychromatic lusture is seen in- 
Select and explain. 
A. Complicated cataract, B. Diabetes mellitus, C. Post radiation cataract, D. Congenital cataract
A: Complicated cataract
Answer: A: Complicated cataract 
Explanation: 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