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: Anatomy
Thoracic duct opens into ? 
Select and explain. 
A. Subclan vein, B. Internal jugular vein, C. Right brachiocephalic vein, D. Left brachiocephalic vein
D: Left brachiocephalic vein
Answer: D: Left brachiocephalic vein 
Explanation: Left brachiocephalic vein