Answer: Complete protein source.
Explanation:
Complete protein source can be defined as the food sources that contains each of the nine amino acids. It is the adequate amount of diet which is required by the body in order to meet the demand of the body.
Rice and beans are complementary proteins which are combined together in order to make a complementary proteins.
The bean and rice alone does not makes complementary diet so they are combined together to form a complementary diet which has all the 9 essential amino acids.
Single source complete protein are yogurt, cheese, milk, egg, red meat et cetera.
