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
[{'content': 'True regarding endothelin 1 are all, except \nSelect and explain. \nA. Bronchodilation, B. Vasoconstriction, C. Decreased GFR, D. Has inotropic effect', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]