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
Structure passing along with the aoa in the diahragmatic opening : 
Select and explain. 
A. Thoracic duct, B. Greater splanchnicn nerve, C. Sigmoid mesocolon, D. Internal iliac aery
A: Thoracic duct
Answer: A: Thoracic duct 
Explanation: A i.e. Thoracic duct