This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drug Abuse, Subject name: Forensic Medicine
[{'content': 'Cavett test is used for the detection of ___ in blood \nSelect and explain. \nA. Barbiturates, B. Alcohol, C. Opiates, D. Cyanides', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Methods to find blood alcohol levels Cavett testQ Alcohol dehydrogenase method Kozelka & Hine test Gas chromatography (most specificQ) Breath analyser', 'role': 'assistant'}]