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
[{'content': 'The poisoning causes by bullet retained inside the body is \nSelect and explain. \nA. Iron, B. Phosphorus, C. Nitro cellulose, D. Lead', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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.', 'role': 'assistant'}]