<prompt> Widmark Formula is used forOpiumCannabisAlcoholAmphetamine  <response>: 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 Ewans sign morbid jealousy is seen in alcohol abuse, and Widmark formula is used to determine the quantity of alcohol taken by person. 