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
What is the best route for total parenteral nutrition? 
Select and explain. 
A. Brachial vein, B. Femoral vein, C. Saphenous vein, D. Subclavian vein
D: Subclavian vein
Answer: D: Subclavian vein 
Explanation: Subclavian vein is considered as best route because the catheter lies flat on chest wall.