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
Thoracic duct can be identified by 
Select and explain. 
A. Bear's triangle, B. Poirier's triangle, C. Petit's triangle, D. Koch's triangle
B: Poirier's triangle
Answer: B: Poirier's triangle 
Explanation: Thoracic duct is identified within Poirier's triangle which is formed by arch of aorta, left subclavian artery & vertebral column.