This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
All are found is Posterior Mediastinum except: 
Select and explain. 
A. Esophagus, B. Azygos vein, C. Thymus, D. Sympathetic Trunk
C: Thymus
Answer: C: Thymus 
Explanation: Ans. C. ThymusThe part behind the pericardium (enclosing heart) is called posterior mediastinum. Its contents are - Esophagus, thoracic duct, descending aorta, Sympathetic Trunk, Azygos vein, hemiazygos vein, accessory hemiazygos vein, vagus nerve, posterior mediastinal lymph nodes.