This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drug Abuse, Subject name: Forensic Medicine
[{'content': 'Pupillary dilatation is seen in which of the following drug abuse ? \nSelect and explain. \nA. Organophosphorus compounds, B. Belladona, C. Heroin, D. Morphine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ATROPA BELLADONNA AND HYOSCYAMUS NIGER: Atropa belladonna/ deadly nightshade is a plant of Europe and Asia. All pas are toxic The active principle is - hyoscyamine. This group of compounds acts by inhibiting the muscarine effects of acetylcholine. Mydriatic Test: A drop of the solution to be tested is put into the eyes of a cat. The pupils dilate within half hour if datura is present, due to the presence of atropine. Drugs causing dilatation of pupils: Datura, Atropine, Belladonna, Cannabis, Cocaine, Alcohol', 'role': 'assistant'}]