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
Best vein for total parenteral nutrition is ? 
Select and explain. 
A. Subclan vein, B. Femoral vein, C. Brachial, D. Saphenous
A: Subclan vein
Answer: A: Subclan vein 
Explanation: Ans. is 'a' i.e. Subclan vein The preferred site for central vein infusion is the superior vena cava & preferred access sites are subclan > jugular > femoral vein.