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: Surgery
Commonest cause of esophageal performation is? 
Select and explain. 
A. Acid ingestion, B. Hyperemesis, C. Instrumentation, D. Carcinoma infiltrating
C: Instrumentation
Answer: C: Instrumentation 
Explanation: Ans. is 'c' i.e. Instrumentation