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: Surgery
A patient requiring total parental nutrition for more than a month via central venous catheter. All are done except 
Select and explain. 
A. Change central venous catheter tube every two weeks routinely, B. LFT, BUN must be done weekly once, C. Electrolytes must be checked every 2-3 days once, D. Sudden glucose intolerance is an early sign of sepsis
A: Change central venous catheter tube every two weeks routinely
Answer: A: Change central venous catheter tube every two weeks routinely 
Explanation: Central venous catheter is changed only if infected is suspected or catheter is blocked.