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: Psychiatry
[{'content': 'Widmark Formula is used for \nSelect and explain. \nA. Opium, B. Cannabis, C. Alcohol, D. Amphetamine', 'role': 'user'}, {'content': "Answer: C \nExplanation: C i.e. Alcohol The neuropathological lesion of wernicke - Karsakoff syndrome are symmetrical & paraventricular, involving the mammillary bodyQ, the thalamus, hypothalmus, mid brain, pons, medulla, fornix & cerebellum. Mc Ewan's sign & morbid jealousy is seen in alcohol abuse, and Widmark formula is used to determine the quantity of alcohol taken by person.", 'role': 'assistant'}]