This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Which of the following is not the cause of macrocytic anemia 
Select and explain. 
A. Orotic aciduria, B. Lesch Nyhan syndrome, C. Transcobalamin deficiency, D. Abetalipoproteinemia
D: Abetalipoproteinemia
Answer: D: Abetalipoproteinemia 
Explanation: Abetalipoproteinemia has Acanthocytes (Spur cells).
It is not a cause of macrocytic anemia.