<prompt> TIGAR-O classification is forAcute pancreatitisChronic pancreatitisPancreatic cancerPancreatic injuries  <response>: Chronic pancreatitis Classification of various causes of chronic pancreatitis based on TIGAR-O system TIGAR-O consists of Toxic metabolites Idiopathic Genetic Autoimmune Recurrent severe Obstructive Ref: Sabiston 20th edition Pgno :1531-1536 