Concept:A ginnery is a factory where cotton is processed to remove seeds from its fibre or lint.
Explanation:The central operation in a ginnery is ginning, which separates cotton seeds from the lint.
This step is essential before the cotton lint can be used for making textiles.
Oil extraction, seed detoxification, and cake production are later processing activities.
These activities are performed in oil mills or feed mills, not in a ginnery.
Therefore, the correct option describes only the separation process.
Answer:C. separation of cotton seeds from lint