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
Elschnig's pearls are a sign of: 
Select and explain. 
A. Chronic uveitis, B. Secondary cataract, C. Cystoid macular oedema, D. All of the above
B: Secondary cataract
Answer: B: Secondary cataract 
Explanation: Ans. Secondary cataract