<prompt> Answer this question truthfullyWhat is the cause of macrocytic anemia?  <response>: <reason> Common causes of macrocytic anemia may include: causes of megaloblastic anemia and non megaloblastic anemia: Vitamin B12 Deficiency: Deficient intake Deficient intrinsic factor pernicious anaemia or gastrectomy Bilogical competition for B12 by diverticulosis, fistula, intestinal anastomosis, achlorhydria and infection by the marine parasite Diphyllobothrium latum Selective B12 malabsorption congenital and drug-induced Chronic pancreatitis Ileal resection and bypass Folate Deficiency: Deficient intake Alcoholism Increased needs: pregnancy, infant, rapid cellular proliferation, and cirrhosis Malabsorption congenital and drug-induced Intestinal and jejunal resection Toxins and Drugs: Amobarbital sodium Cycloserine Cytarabine Ethotoin Folic acid antagonists methotrexate Pergolide Purine antagonists 6-mercaptopurine Pyrimidine antagonists cytosine arabinoside Phenobarbital Pyrimethamine Secobarbital sodium Trimethoprim Erythroleukemia.Myelodysplasia Chronic liver disease Reticulocytosis HypothyroidismLess common causes of macrocytsic anemia include: Combined deficiencyvitamin B12 folate Tropical sprue Inherited DNA Synthesis Disorders: Deficient thiamine and factors e.g. enzymes responsible for folate metabolism. Lesch-Nyhan Syndrome Methylmalonic aciduria Orotic aciduriaLesch-Nyhan Syndrome Orotic aciduriaList the causes of the disease in alphabetical order:Achlorhydria Alcoholism Amobarbital sodium Chronic liver diseases Cycloserine Cytarabine Diphyllobothrium latum Diverticulosis Ethotoin Fistula Folate deficiency Folic acid antagonists methotrexate Hypothyroidism Lesch-Nyhan Syndrome Methylmalonic aciduria Myelodysplasia Orotic aciduria Pergolide Pernicious anemia Purine antagonists 6-mercaptopurine Pyrimidine antagonists cytosine arabinoside Phenobarbital Pregnancy Pyrimethamine Reticulocytosis Secobarbital sodium Trimethoprim Vitamin B12 deficiency 