<prompt> 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 diagnosisIron defficiency anemiaPb poisoningalcoholismAnemia of chronic disease  <response>: ref : harrisons 21st ed 