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': 'Hb - Barts is \nSelect and explain. \nA. α2 β2, B. αo β4, C. αo γ4, D. α2 γ2', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Option a - HbA\nOption b - HbH\nOption d - HbF.', 'role': 'assistant'}]