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 formula helps in the measurements of blood level of: \nSelect and explain. \nA. Barbiturates, B. Cocaine, C. Alcohol, D. Benzodiazepines", 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Alcohol', 'role': 'assistant'}]