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
Best vein for total parenteral nutrition is: 
Select and explain. 
A. Subclan vein, B. Femoral vein, C. Brachial vein, D. Saphenous vein
A: Subclan vein
Answer: A: Subclan vein 
Explanation: Best vein for total parenteral nutrition is: subclan vein > internal jugular vein > femoral vein