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': 'Vitrectomy should be considered if the vitreous haemorrhage is not absorbed within: \nSelect and explain. \nA. 1 month, B. 3 months, C. 6 months, D. 2 months', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. 3 months', 'role': 'assistant'}]