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. Diabetes, B. Atopic Dermatitis, C. Myotonic dystrophy, D. Rubella
C: Myotonic dystrophy
Answer: C: Myotonic dystrophy 
Explanation: Presenile cataract occurs in patients with atopic dermatitis (stellate opacities mostly posterior), myotonic dystrophy (christmas tree cataract) and GPUT & GK enzyme deficiency. Reference: A K Khurana, 5th Edition, Page 95