Concept:
Wheat milling is the process of separating the endosperm from the other components of the wheat kernel to produce flour.
• A wheat kernel consists of three main parts: the endosperm, the bran, and the germ.
• Flour is primarily made from the starchy endosperm.
• Any part of the kernel not present in refined flour is considered a byproduct.
Step 1: Identifying the anatomical components.
The Bran is the hard outer layer of the wheat kernel.
The Germ is the nutrient-rich embryo of the seed.
Step 2: Defining Middling's.
During the milling process, some endosperm particles remain attached to small pieces of bran.
These coarse particles are known as "middling's."
Step 3: Conclusion.
In a standard commercial mill, the primary byproducts include the bran, the germ, and the middling's.
Final Answer: (A)