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: Medicine
[{'content': 'All of the following are true about b thalassemia trait, Except - \nSelect and explain. \nA. Microcytic hypochromic picture, B. ↑ed HbA2, C. ↑ed HbF, D. Patient requires blood transfusion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]