This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'case his peripheral smear is showing hypessegmented neutrophils dye deficiency of \nSelect and explain. \nA. vit B12 deficiency, B. Folate deficiency, C. Iron defficiency, D. Thalasemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ref : robbins 10th ed', 'role': 'assistant'}]