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: Radiology
Following is not a differential diagnosis for middle mediastinal mass 
Select and explain. 
A. Tortuous innominate artery, B. Bronchogenic cyst, C. Aortic arch aneurysm, D. Neuro enteric cyst
D: Neuro enteric cyst
Answer: D: Neuro enteric cyst 
Explanation: Neuroenteric cyst - Posterior mediastinum.