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: Forensic Medicine
[{'content': "Widmark's formulae are used for estimation of \nSelect and explain. \nA. Cyanides, B. Alcohol, C. D.D.T., D. Teeth", 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Alcohol', 'role': 'assistant'}]