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: Surgery
[{'content': 'The subconjunctival hemorrhage remains bright red in color for a long time because? \nSelect and explain. \nA. Permeability of conjunctiva to the oxygen, B. Natural color of the blood, C. Lack of drainage of the pooled blood, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]