This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Forensic Toxicology - Concepts, Statutes, Evidence, and Techniques, Subject name: Forensic Medicine
[{'content': 'Smoky stool is seen in which poisoning? \nSelect and explain. \nA. Mercury, B. Phosphorous, C. Iodine, D. Lead', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) PhosphorousRef. Parikh 6/e, p 9.2, Textbook of forensic medicine and Toxicology by Nagesh kumar rao, p 371, Modern medical toxicology byV.V. Pillary, 3/e, p 61', 'role': 'assistant'}]