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
Smoky stool is seen in which poisoning? 
Select and explain. 
A. Mercury, B. Phosphorous, C. Iodine, D. Lead
B: Phosphorous
Answer: B: Phosphorous 
Explanation: 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