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
Structures passing through the aortic hiatus of diaphragm area) Aortab) Azygos veinc) Hemiazygos veind) Thoracic ducte) Sympathetic trunk 
Select and explain. 
A. acd, B. abd, C. abc, D. ab
B: abd
Answer: B: abd 
Explanation: Aortic opening
-        Level- T12
-        At osseoaponeurosis between right and left crus
-        Structures transmitted

   Aorta
   Thoracic duct
   Azygos vein