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: Unknown
[{'content': 'Which of the following protein chain pairs represent fetal hemoglobin? \nSelect and explain. \nA. a2b2, B. a2e2, C. a2U2, D. a2d2', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., a2U2 * Different hemoglobins (depending upon there polypeptide chains) are # HbA or adult hemoglobin (a2b2), # HbF or fetal hemoglobin (a2g2), # HbA2 or minor adult hemoglobin (a2d2), # Gower-1 ( zeta 2 epsilon 2), # Gower-2 (a2e2) # Portland (z2g2)", 'role': 'assistant'}]