<prompt> Most common cause of Rapid progressive glomerulonephritis in children isGood Pasteur syndromeMembranous glomerulonephritisIg A nephropathyPauci - immune glomerulonephritis  <response>: Pauci - immune glomerulonephritis like Churg Strauss, Wegeners glomerulonephritis have highest risk for RPGN. 