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: Surgery
[{'content': 'Invertogram is taken after - \nSelect and explain. \nA. 2 hrs after birth, B. 4 hrs after birth, C. 6 hrs after birth, D. 8 hrs after birth', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]