This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia, Subject name: Pharmacology
[{'content': 'A female presents with placenta previa with active bleeding and blood pressure of 80/50 mm Hg and pulse rate of 140 bpm. The choice of anaesthesia for emergency cesarean section in this female is? \nSelect and explain. \nA. General anesthesia with intravenous propofol, B. General anesthesia with intravenous ketamine, C. Spinal anesthesia, D. Epidural anesthesia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (B) General anesthesia with intravenous ketamine(Ref: Williams Obstetrics 24th/e p518; Morgan 4th/197-199)The patient is presenting with shock, so spinal anesthesia cannot be used. Among the general anesthetics, ketamine is drug of choice for induction in patients with low blood pressure.', 'role': 'assistant'}]