D) ginning ; as we all know that cotton fibre is get separated from their seeds by the comb which is done by the process of ginning of cotton.

Process of Separating Cotton Fibre from Seeds: Ginning

To separate cotton fibre from seeds, the process of ginning is used. Ginning is a mechanical process that involves separating the cotton fibres from the seeds and any other impurities. Here is how the process works:

Ginning Process:
- Cotton bolls are harvested from the fields and brought to the ginning mill.
- The cotton bolls are then fed into the gin, which is a machine that separates the cotton fibre from the seeds.
- The gin uses saws or teeth to pull the cotton fibres away from the seeds.
- The separated cotton fibres are then collected and compressed into bales for further processing.

Importance of Ginning:
- Ginning is a crucial step in the production of cotton as it allows for the extraction of the valuable cotton fibres.
- By separating the fibres from the seeds, the cotton can be processed further to create textiles and other products.

Other Methods:
- Apart from ginning, there are no other efficient methods to separate cotton fibre from seeds. Ginning is the most commonly used and effective method for this purpose.

In conclusion, the process of ginning plays a vital role in the production of cotton by separating the valuable fibres from the seeds. This process ensures that the cotton fibres can be used to create a wide range of products, making it an essential step in the textile industry.