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
Dislocation of lens is seen in all the following conditions except: 
Select and explain. 
A. Congenital rubella, B. Marchesani's syndrome, C. Marfan syndrome, D. Homocystimuria
A: Congenital rubella
Answer: A: Congenital rubella 
Explanation: Ans. Congenital rubella