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
[{'content': 'Christmas tree cataract is seen in? \nSelect and explain. \nA. Diabetes, B. Atopic Dermatitis, C. Myotonic dystrophy, D. Rubella', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]