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
The lens can be dislocated in all except - 
Select and explain. 
A. Homocystinuria, B. Marfan’s syndrome, C. Trauma, D. Wilson’sdisease
D: Wilson’sdisease
Answer: D: Wilson’sdisease 
Explanation: Ectopia lentis 

Ectopia lentis is defined as displacement or malposition of the crystalline lens of the eye.
The lens is considered dislocated (luxated) when it lies completely outside the lens patellar fossa.
The lens is described as subluxated when it is partially displaced but contained within the lens space. Causes are