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: Physiology
True regarding endothelin 1 are all, except 
Select and explain. 
A. Bronchodilation, B. Vasoconstriction, C. Decreased GFR, D. Has inotropic effect
A: Bronchodilation
Answer: A: Bronchodilation 
Explanation: None