This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ballistics, Subject name: Forensic Medicine
The poisoning causes by bullet retained inside the body is 
Select and explain. 
A. Iron, B. Phosphorus, C. Nitro cellulose, D. Lead
D: Lead
Answer: D: Lead 
Explanation: Souvenir Bullets are present for a long time in the body so lead poisoning usually associated with Souvenir bullets. A dense fibrous tissue capsule usually surrounds it. Lead poisoning may occur due to absorption of lead from lead bullets remaining in a body. Synol fluid is capable of dissolving lead.