What does tofu primarily consist of?

Tofu primarily consists of soya milk curds, which is the basis of its production. Tofu is made by coagulating soy milk, a product of crushing soybeans and mixing them with water, and pressing the resulting curds into solid blocks. This process not only retains the key nutritional components of soybeans, such as protein and essential amino acids, but also gives tofu its unique texture and flavor.

The other options do not align with the composition of tofu. Cow's milk is unrelated to tofu's soy-based origins, vegetable oils are typically not a component of tofu, and bread flour is completely different from what makes up tofu. Understanding this composition is important for recognizing tofu's role as a protein source in vegetarian and vegan diets.