Which of the following is a source of protein?

Chicken is a source of protein because it is an animal product that contains high levels of protein, which is essential for building and repairing tissues in the body. It provides all the essential amino acids necessary for the body to function properly, making it a complete protein source. Lean meats like chicken are particularly recommended for maintaining muscle mass and supporting overall health.

In contrast, while rice and wheat do contain some protein, they are primarily sources of carbohydrates. Their protein content is lower compared to that of animal products like chicken. Butter, on the other hand, is primarily composed of fat and provides minimal amounts of protein. Therefore, chicken stands out as the most significant source of protein among the choices given.