This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 2, Subject name: Forensic Medicine
[{'content': 'The triad of alopecia, neuropathy and diarrhoea results from \nSelect and explain. \nA. Thallium, B. Mercury, C. Dathura, D. Opium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Thallium Poisoning * Ideal homicidal poison features * Features resemble natural disease, Gullain Barre syndrome * Mees lines present * Triad of alopecia, neuropathy and diarrhea * Pseudomotor neuropathy', 'role': 'assistant'}]