This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': 'Baroreceptor stimulation produces \nSelect and explain. \nA. Decreased hea rate & BP, B. Increased hea rate & BP, C. Increased cardiac contractility, D. Decreased cardiac contractility', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Baroreceptor reflex stimulates the vagus nerves causes release of acetylcholine at the vagal endings in the hea, thus giving a parasympathetic effect.Ref: Guyton and Hall textbook of medical physiology 13th edition. Page:155', 'role': 'assistant'}]