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
Esophagus is present in all except ? 
Select and explain. 
A. Superior mediastinum, B. Middle mediastinum, C. Anterior mediastinum, D. Posterior mediastinum
C: Anterior mediastinum
Answer: C: Anterior mediastinum 
Explanation: Ans. is 'c' i.e., Anterior mediastinum Esophagus mainly descends in superior and posterior mediastinum.Esophagus is usually not a content of middle mediastinum, but it forms posterior boundry of middle mediastinum (BDC Vol.-1, 6`"/e p. 246).Esophagus has no relation to anterior mediastinum. Thus, among the given options, best answer is anterior mediastinum.