This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anaesthesia
[{'content': 'Preanesthetic medication is used for A/E : \nSelect and explain. \nA. Decrease of anesthetic dose, B. Decrease BP, C. Prevent aspiration, D. Produce amnesia for peri-operative events', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Decrease BP', 'role': 'assistant'}]