This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical, surgical and gynaecological illness complicating pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'A 20yr old P1L1 with RhD negative pregnancy had a spontaneous vaginal delivery. Her baby is RhD positive. Anti D Ig should be administered within \nSelect and explain. \nA. 72 hours, B. 7 days, C. 10 days, D. 30 days', 'role': 'user'}, {'content': 'Answer: A \nExplanation: * For successful immunoprohylaxis anti D Ig should be given as soon as possible after the sensitizing event but always within 72hours * If not given within 72hours, effo should still be made to give anti D Ig, as a dose given within 9 to 10 dose will offer some protection * Women who is already sensitized should not be given anti D Ig Reference: Greentop guidelines no 22', 'role': 'assistant'}]