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': 'In maturity onset diabetes mellitus, ophthalmoscopy should be done at – \nSelect and explain. \nA. Immediately, B. After 5 years, C. After 10 years, D. After 15 years', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]