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
Phossy jaw is seen in? 
Select and explain. 
A. White phosphorous, B. Red phosphorous, C. Arsenic, D. Antimony
A: White phosphorous
Answer: A: White phosphorous 
Explanation: Ans. is 'a' i.e., White phosphorous o Phossy jaw is caused by chronic phosphorus poisoning.o Toothache is the first symptom which is associated with loosening of teeth, necrosis of gums and osteomyelitis of jaw. Therefore chronic phosphorus poisoning is also known as phossy jaw (or glass jaw).o All phosphorus poisoning are caused by white (yellow) phosphorus (Red phosphorus is nontoxic).