This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid, Electrolyte and Nutrition, Subject name: Surgery
Which of the following is the most common complication of TPN? 
Select and explain. 
A. Catheter related complications, B. Acidosis, C. Acalculous cholecystitis, D. Hypokalemia
A: Catheter related complications
Answer: A: Catheter related complications 
Explanation: - Most common complication of central venous catheterization (CVC): catheter related sepsis - Most dangerous complication following CVC: pneumothorax