Which one of the following elements is not naturally found in human beings?

• Copper is a mineral that is found throughout the body. It helps your body make red blood cells and keeps nerve cells and your immune system healthy. It also helps form collagen, a key part of bones and connective tissue. • Zinc is found in cells throughout the body. It is needed for the body's defensive (immune) system to properly work. It plays a role in cell division, cell growth, wound healing, and the breakdown of carbohydrates. Zinc is also needed for the senses of smell and taste. • Iodine is an essential trace mineral not made by the body so must be obtained by food or supplements. It is found naturally in some foods and is added to supplements and some salt seasonings. Hence option C is correct. • Although Lead is not made by the human body and is non-biodegradable and harmful for the human body, it is found in the human bones and teeth.