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
The subconjunctival hemorrhage remains bright red in color for a long time because? 
Select and explain. 
A. Permeability of conjunctiva to the oxygen, B. Natural color of the blood, C. Lack of drainage of the pooled blood, D. None
A: Permeability of conjunctiva to the oxygen
Answer: A: Permeability of conjunctiva to the oxygen 
Explanation: None