This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Iron Deficiency and Megaloblastic Anemia, Subject name: Pathology
Pernicious anemia associated with - 
Select and explain. 
A. Gastric pathology, B. Renal pathology, C. Esophageal pathology, D. Oral pathology
A: Gastric pathology
Answer: A: Gastric pathology 
Explanation: Ans. is 'a' i.e., Gastric Pathology Anemias of Vitamin B12 Deficiency: Pernicious Anemiao Pernicious anemia is a specific form of megaloblastic anemia caused bv an autoimmune gastritis that impairs the production of intrinsic factor, which is required for vitamin B12 uptake from the g ut.o Histologically, there is a chronic atrophic gastriti smarked by loss of parietal cells, prominent infiltrate of lymphocytes and plasma cells, and megaloblastic changes in mucosal cells.