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': 'Diabetes mellitus can lead to: \nSelect and explain. \nA. Vitreous haemorrhage, B. Rubeosis iridis, C. Retinal detachment, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. Vitreous haemorrhage; B i.e. Rubeosis iridis; C i.e. Retinal detachment', 'role': 'assistant'}]