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
Christmas tree cataract is seen in – 
Select and explain. 
A. Down's syndrome, B. Rubella, C. Myotonic dystrophy, D. Diabetes
C: Myotonic dystrophy
Answer: C: Myotonic dystrophy 
Explanation: Christmas tree cataract is seen in myotonic dystrophy (dystrophia myotonia).