This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia, Subject name: Pharmacology
[{'content': 'A female presents with placenta pre with active bleeding and blood pressure of 80/50 MM Hg and pulse rate of 140 bpm. The choice of anesthesia for emergency cesarean section of 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: Refer Williams Obstetrics 24th/e p 518 The patient is presenting with shock, so spinal anesthesia can't be used Among the general anesthetics, Ketamine is drug of choice for induction in patients with low blood pressure", 'role': 'assistant'}]