If all bullets could not be removed from gun shot injury of a man, it may cause poisoning by A. Mercury B. Lead C. Iron D. Arsenic

The correct answer is B. Lead.

Lead is a heavy metal that is toxic to humans. It can be absorbed into the body through the skin, lungs, or digestive system. Once in the body, lead can damage the nervous system, kidneys, and reproductive system. It can also cause developmental problems in children.

If a bullet is not removed from a gunshot wound, the lead in the bullet can slowly leach out and be absorbed by the body. This can lead to

lead poisoning, which can be a serious and even life-threatening condition.

The other options are incorrect

because they are not metals that are toxic to humans. Mercury is a heavy metal that is toxic, but it is not typically found in bullets. Iron is a mineral that is essential for human health, but it is not toxic in small amounts. Arsenic is a metalloid that is toxic, but it is not typically found in bullets.

In conclusion, if all bullets could not be removed from a gunshot injury of a man, it may cause poisoning by lead.