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
Marfan's syndrome associated with? 
Select and explain. 
A. Retinal detachment, B. Vitreous hemorrhage, C. Ectopia lentis, D. Roth spots
C: Ectopia lentis
Answer: C: Ectopia lentis 
Explanation: Ectopia lentis REF: Khurana 4th ed p. 422, Pediatric ophthalmology: A clinical guide by Pamela Gallin Table 8-7 "Marfan's syndrome is the most common cause of subluxated lens of childhood" Differential diagnosis of dislocated/subluxated lens: Trauma Ectopia lentis et pupillae Aniridia Syphilis Megalocornea (X linked recessive) Marfan's syndrome Homocystinuria Hyperlysinemia Sulfite oxidase deficiency Weill- Marchesani