You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is As per etiological classification of diabetes mellitus, Gestational diabetes mellitus is and explain in detail?
Etiologic Classification of Diabetes MellitusI. Type 1 diabetes (beta cell destruction, usually leading to absolute insulin deficiency)Immune-mediatedIdiopathicII. Type 2 diabetes (may range from predominantly insulin resistance with relative insulin deficiency to a predominantly insulin secretory defect with insulin resistance)III. Other specific types of diabetesGenetic defects of beta cell development or function characterized by mutations in:Genetic defects in insulin actionDiseases of the exocrine pancreas--pancreatitis, pancreatectomy, neoplasia, cystic fibrosis, hemochromatosis, fibrocalculous pancreatopathy, mutations in carboxyl ester lipaseEndocrinopathies--acromegaly, Cushing's syndrome, glucagonoma, pheochromocytoma, hypehyroidism, somatostatinoma, aldosteronomaDrug- or chemical-induced- Glucocoicoids, vacor (a rodenticide), pentamidine, nicotinic acid, diazoxide, b-adrenergic agonists, thiazides, calcineurin and mTOR inhibitors, hydantoins, asparaginase, a-interferon, protease inhibitors, antipsychotics (atypicals and others), epinephrineInfections--ongenital rubella, cytomegalovirus, coxsackievirusUncommon forms of immune-mediated diabetes--"stiff-person" syndrome, anti-insulin receptor antibodiesOther genetic syndromes sometimes associated with diabetes--IV. Gestational diabetes mellitus (GDM)Ref: Harrison 19e pg: 2399