This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cataract, Subject name: Ophthalmology
[{'content': 'Christmas tree cataract is seen in \nSelect and explain. \nA. Atopic dermatitis, B. Diabetes, C. Myotonic dystrophy, D. Alpo syndrome', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Christmas tree cataract is seen in myotonic dystrophy Christmas tree cataract These are polychromatic and highly reflective, needle-shaped opacities in the lens seen in myotonic dystrophy. Usually it does not disturb vision.', 'role': 'assistant'}]