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': 'Anti D immunoglobulin must be given to a mother of 0 negative group with a bay of 0 positive within: \nSelect and explain. \nA. At bih 4 hours, B. 4 hours, C. 24 hours, D. 72 hours', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 72 hours', 'role': 'assistant'}]