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': 'The umbilical cord stump of a newborn most frequently sloughs off about the : \nSelect and explain. \nA. Second day after delivery, B. Fifth day after delivery, C. 10th day after delivery, D. 15th day after delivery', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 10th day after delivery', 'role': 'assistant'}]