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
Relaxation of mesangial cells of kidney is brought about by 
Select and explain. 
A. PGF2a, B. Vasopressin, C. cAMP, D. Endothelin
C: cAMP
Answer: C: cAMP 
Explanation: 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)