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': 'The canal of Schlemm possesses the following anatomic characteristics except: \nSelect and explain. \nA. Contains red cells, B. Contains aqueous, C. Lined by endothelium, D. Contains paitions resembling the dural venous sinuses', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Contains red cells', 'role': 'assistant'}]