This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
A 20yr old 0 presented with Yo of fatigue and tiredness On investigation Hb 9gmt Mcv 10% FL . PS shows macrocytic RBC&;s with hypersegmented neutrophils what is the most likely diagnosis 
Select and explain. 
A. Iron defficiency anemia, B. Pb poisoning, C. alcoholism, D. Anemia of chronic disease
C: alcoholism
Answer: C: alcoholism 
Explanation: ref : harrisons 21st ed