This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Body composition and Acid base Balance, Subject name: Pediatrics
Metabolic compensation in a child with respiratory acidosis takes how much time? 
Select and explain. 
A. < 1 day, B. 1-2 days, C. 3-4 days, D. More than 7 days
C: 3-4 days
Answer: C: 3-4 days 
Explanation: Secondary respiratory compen sations to metabolic acid-base disorders occur within minutes and is completed by 12 to 24 hr. In contrast secondary metabolic compensation of respiratory disorders begins more slowly and takes 2 to 5 days for completion. The compensatory mechanisms do not return the pH to normal until the underlying disease process has been appropriately treated.