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: Pathology
[{'content': 'HbA\n2\n is raised in - \nSelect and explain. \nA. Beta thalassemia trait, B. Sickle cell anemia, C. Hereditory spherocytosis, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: HbA2\xa0is raised in thalassemia minor (β-Thalassemia trait).', 'role': 'assistant'}]