This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diagnosis in obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'Sinusoidal hea rate pattern is seen in: \nSelect and explain. \nA. Placenta pre, B. Vasa pre, C. Battledore placenta, D. Succenturiate placenta', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sinusoidal hea rate is observed in the antepaum period due to severe fetal anaemia as in Rh immunisation ,ruptured vasa prae or twin twin transfusion.It is rare in intrapaum period. Refer page no 521 of Text book of obstetrics,sheila balakrishnan,2 nd edition.', 'role': 'assistant'}]