Final answer:
Soy products, like tofu, are indeed a complete protein from a plant source, making them an excellent choice for vegans who need to ensure they consume all essential amino acids from their diet. Option a is correct it is true.
Step-by-step explanation:
Soy products, like tofu, are a complete protein that comes from a plant source. This is true, as they provide adequate amounts of all nine essential amino acids necessary for human nutrition. Most plant proteins are incomplete because they lack one or more of these essential amino acids.
However, soy is an exception and can be exceptionally beneficial for vegans, who do not consume animal products and therefore must be mindful to obtain all essential amino acids from their diet. Vegans need to pay special attention to the protein they eat because it is typically more challenging to obtain all essential amino acids from single plant sources.
Complementary proteins become important here, as combining different plant foods can help provide the complete set of essential amino acids. Foods like legumes, nuts, and seeds are great sources of protein for vegans, and when complemented correctly, can satisfy nutritional requirements.