This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Forensic Toxicology - Concepts, Statutes, Evidence, and Techniques, Subject name: Forensic Medicine
[{'content': "'Cavett; test is used for the detection of____ blood: \nSelect and explain. \nA. Barbiturates, B. Alcohol, C. Opiates, D. Cyanides", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (B). Alcohol(Ref: Review of Forensic Medicine and toxicology; Gautum Biswas; 2nd edition; Pg - 553)Methods to find blood and urine alcohol levelsCavetttestQAlcohol dehydrogenase methodKozelka and Hine testGas chromatography (most specificQ)Breath analyzer', 'role': 'assistant'}]