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
" Phossy jaw" is caused by 
Select and explain. 
A. Lead, B. Mercury, C. Phosphorus, D. Arsenic
C: Phosphorus
Answer: C: Phosphorus 
Explanation: Chronic Phosphorus Poisoning (Phossy Jaw/Glass Jaw/Lucifer's Jaw) : Due to inhalation of fumes over years. Tooth ache (earliest symptom) & swelling of the jaw Loosening of the teeth & Necrosis of lower jaw Sequestration of bone in the mandible & multiple sinuses discharging foul-smelling pus.