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: Pharmacology
[{'content': 'Which of the following drug is commonly used in narcoanalysis ? \nSelect and explain. \nA. Atropine sulfate, B. Scopolamine hydrochloride, C. Phenobarbitone, D. Morphine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Controlled administration of intravenous hypnotics to\xa0obtain information from subjects who are unable or unwilling\xa0to provide it otherwise, is known as Narcoanalysis\xa0or Narcosynthesis.\nDrugs used for narcoanalysis are:\n\nEthanol\nScopolamine\nTemazepam\nBarbiturates like Thiopentone and Amobarbital\n\nThese drugs are also known as truth drug or truth serum.\n\nPhenobarbitone is not used, rather amobarbital is used\xa0for narcoanalysis.', 'role': 'assistant'}]