This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pregnancy in Rh-negative Women, Subject name: Gynaecology & Obstetrics
[{'content': "A G1+O attends the antenatal clinic for the booking visit at 12 weeks. Her blood group is B Rhesus negative.What is the next step in the management? \nSelect and explain. \nA. Determine the fetal blood group, B. Determine the husband's blood group, C. Perform an ultrasound scan, D. Perform Rhesus antibody titer", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is b, i.e. Determine the husbands blood groupWhen a rhesus negative primipara attends the antenatal clinic, the first step is to determine her husband's blood group. If the husband is Rhesus negative no further investigations are necessary, as all babies will be Rhesus negative.", 'role': 'assistant'}]