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
Which one of the following conditions is associated with Soemmering's ring? 
Select and explain. 
A. After cataract, B. Keratoconus, C. Wilson's disease, D. Uveitis
A: After cataract
Answer: A: After cataract 
Explanation: After cataract is also known as secondary cataract. It is the opacity which persists or develops after any form of planned or accidental extracapsular lens extraction. It may present as thickened posterior capsule or a dense membranous after cataract or Soemmering's ring which refers to a thick ring of after cataract formed behind the iris, enclosed between the two layers of capsule or Elschnig's pearls in which the vacuolated subcapsular epithelial cells are clustered like soap bubbles along the posterior capsule.