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: Pediatrics
[{'content': 'Macrocytosis is seen in all of the following disorders, except- \nSelect and explain. \nA. Hypothyroidism, B. Thalassemia major, C. Folic acid deficiency, D. B12 deficiency', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Thalassemia major", 'role': 'assistant'}]