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
Eye lens dislocation seen in –a) Marfan\'s syndromeb) Homocystinuriac) Down\'s syndromed) Klinefelter syndrome 
Select and explain. 
A. ac, B. a, C. ab, D. bc
C: ab
Answer: C: ab 
Explanation: Marfan syndrome and homocystinuria can cause dislocation of lens.