This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'Relaxation of mesangial cells of kidney is brought about by \nSelect and explain. \nA. PGF2a, B. Vasopressin, C. cAMP, D. Endothelin', 'role': 'user'}, {'content': "Answer: C \nExplanation: Mesangial cells contractionMesangial cells relaxationEndothelinsAngiotensin IIVasopressinNor-epinephrinePlatelet -activation factorPlatelet-derived growth factorThromboxane A2PGF2LT-C4and D4HistamineANPDopaminePGE2cAMP(Refer: Ganong's Review of Medical Physiology 24thedition, pg no: 678-682)", 'role': 'assistant'}]