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': 'Normal aqueous production rate is about: \nSelect and explain. \nA. 21/min, B. 2.3 pl/min, C. 2.6 pl/min, D. 2.9 pl/min', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. 2.3 pl/min', 'role': 'assistant'}]