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': 'Abnormal Fetal tachycardia is defined as: \nSelect and explain. \nA. Fetal hea rate >= 160 bpm, B. Fetal hea rate >= 180 bpm, C. Fetal hea rate >= 200 bpm, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Fetal hea rate above 180bpm is considered as abnormal tachycardia. Refer page no 519 of Text book of obstetrics,sheila balakrishnan,2 nd edition.', 'role': 'assistant'}]