This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
[{'content': 'Pressure on carotid sinus cause \nSelect and explain. \nA. Hyperapnea, B. Reflex bradycardia, C. Tachycardia, D. Dyspnea', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Reflex bradycardiaRef: Ganong, 25th ed/p.590The definition of Baroreflex is - "Whenever blood pressure increases, baroreceptors increase their discharge and send their impulse to medulla which ultimately decreases the blood pressure and decreases heart rate (reflex bradycardia)"', 'role': 'assistant'}]