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: Medicine
Most common cause of mediastinitis is - 
Select and explain. 
A. Tracheal rupture, B. Esophageal rupture, C. Drugs, D. Idiopathic
B: Esophageal rupture
Answer: B: Esophageal rupture 
Explanation: None