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: Gynaecology & Obstetrics
[{'content': 'Bih of infant to delivery of placenta is? \nSelect and explain. \nA. 1st stage, B. 2nd stage, C. 3rd stage, D. 4th stage', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 3rd stage of labour.', 'role': 'assistant'}]