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': 'Endothelium derived relaxing factor (EDRF) induced vasodilatation is mediated by: \nSelect and explain. \nA. Increased intracellular cGMP, B. Decreased intracellular cGMP, C. Increased extracellular cyclic AMP, D. Decreased intracellular cyclic AMP', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Endothelial\xa0cells\xa0produce\xa0endothelium \xadderived relaxing factor (EDRF), a substance that is now known to be nitric oxide (NO).\nNO\xa0and\xa0ANP\xa0hormone\xa0act\xa0via\xa0increasing intracellular cGMP.', 'role': 'assistant'}]