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: Anaesthesia
Most sensitive method of non invasive monitoring of cardio-vascular ischemia in perioperative period is ? 
Select and explain. 
A. NlBP, B. ECG, C. Pulse oximeter, D. ILE
D: ILE
Answer: D: ILE 
Explanation: Ans. is 'd' i.e., TEE