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': 'All of the following about Bezold - Jarisch reflex are true except \nSelect and explain. \nA. Hypeension, B. Bradycardia, C. Capsaicin, D. Rapid shallow breathing', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Activation of chemosensitive vagal C fibers in the cardiopulmonary region (eg, the juxtacapillary region of alveoli, ventricles, atria, great veins, and pulmonary aery) causes profound bradycardia, hypotension, and a brief period of apnea followed by rapid shallow breathing. This response pattern is called the Bezold-Jarisch reflex and was named after the individuals who first repoed these findings. This reflex can be elicited by a variety of substances including capsaicin, serotonin, phenylbiguanide, and veratridine. And not related to hypeension', 'role': 'assistant'}]