This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Megaloblastic Anemia, Subject name: Pathology
Which of the following are the features of pernicious anemia? 
Select and explain. 
A. Hyper-segmented neutrophils, B. Subacute combined degeneration of spinal cord, C. Gastric mucosal atrophy, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Features of pernicious anemia: Hyper-segmented neutrophils Howell-Jolly bodies Megaloblasts Macro-ovalocytosis Ataxia, Subacute combined degeneration of spinal cord Increase levels of methyl malonyl CoA, homocysteine