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: Unknown
Most common cause of metabolic acidosis in anaesthesia is: 
Select and explain. 
A. Hypoventilation, B. Renal failure, C. Hypotension, D. Ketoacidosis
B: Renal failure
Answer: B: Renal failure 
Explanation: Hypotension (shock) causes tissue hypoxia leading to production of lactic acid and this lactic acidosis is th6 most common cause of metabolic acidosis seen during anaesthesia.