A complete protein food has all the essential amino acids that are required by the body from outside because the body can not produce these essential amino acids and in most of the cases the animal source of food provides a complete protein source because these contain all the essential amino acids which is hard to find in vegetables.
The animal foods that have complete protein are fishes, eggs, meat products of animals, dairy products like cheese, milk, etc. These amino acids are necessary to build up the body and perform important metabolic functions. Therefore the right answer is A.
Proteins help to build, repair, and maintain the body's structures. Animal foods typically have more protein than plant foods.In most cases, animal foods provide complete protein.Proteins are made up of amino acids and the body needs all 22 types of amino acids to function correctly. However, the body cannot produce nine of them. A complete protein source refers to a type of food that contains all nine.
