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': 'a - adrenoreceptor stimulation effects are : \nSelect and explain. \nA. Vasoconstriction, B. Vasodilatation, C. Broncho constriction, D. Alveolar bronchoconstriction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Vasoconstriction', 'role': 'assistant'}]