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 the aoa in the diaphragmatic opening : 
Select and explain. 
A. Thoracic duct, B. Sympathetic duct, C. Greater splanchnic nerve, D. Lesser splanchnic nerve
A: Thoracic duct
Answer: A: Thoracic duct 
Explanation: A. i.e. Thoracic duct