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
Persistent hyperplastic primary vitreous is associated with 
Select and explain. 
A. Trisomy 13, B. Trisomy 21, C. Trisomy 5, D. Monosomy 1
A: Trisomy 13
Answer: A: Trisomy 13 
Explanation: Associated with patau syndrome (Trisomy 13).