This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acute coronary syndrome, Subject name: Medicine
Which amongst the following endothelin is involved in MI? 
Select and explain. 
A. Endothelin 1, B. Endothelin 2, C. Endothelin 3, D. Endothelin 4
A: Endothelin 1
Answer: A: Endothelin 1 
Explanation: Plasma ET-1 levels are raised after acute myocardial infarction due to coronary vasoconstriction-Myocardial ischemia -Ventricular dysfunction. Endothelin (ET)-1 is a potent coronary vasoconstrictor.