This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
At systemic aerial mean BP of 50 mmhg urine output is: 
Select and explain. 
A. Nil, B. 0.5 ml/min, C. 1ml/min, D. 2ml/min
A: Nil
Answer: A: Nil 
Explanation: Ref: graph fig:42.5 page no :356 Textbook of physiology Volume 1 7th edition AK Jain