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
α - adrenoreceptor stimulation effects are 
Select and explain. 
A. Vasoconstriction, B. Vasodilatation, C. Broncho constriction, D. Bronchodilatation
A: Vasoconstriction
Answer: A: Vasoconstriction 
Explanation: Vasoconstriction- α1
Vasodilation- β
Bronchoconstriction- M3
 
Bronchodilation- β