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
Length of thoracic duct is: 
Select and explain. 
A. 20 cm, B. 25 cm, C. 30 cm, D. 45 cm
D: 45 cm
Answer: D: 45 cm 
Explanation: In adults the thoracic duct, including the confluence of lymph trunks (or the cisterna chyli in the small propoion in whom the latter is saccular) is 38-45 cm in length and extends from the second lumbar veebra to the base of the neck.