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': 'The hemoglobin to appear first in the fetus is – \nSelect and explain. \nA. Hb A, B. Hb A2, C. Hb F, D. Hb Gowers', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]