The correct answer is C. protein.
Silk is a natural protein fiber that is produced by silkworms. It is a strong, lustrous, and lightweight fiber that is used to make a variety of textiles, including clothing, bedding, and upholstery.
Silk is made up of two proteins: fibroin and sericin. Fibroin is the main component of silk, and it is responsible for the strength and luster of the fiber. Sericin is a glue-like protein that holds the fibroin fibers together.
Silk is a biodegradable fiber, which means that it will break down over time in the environment. It is also a renewable resource, as silkworms can be raised to produce silk.
Carbohydrates are organic compounds that are made up of carbon, hydrogen, and oxygen atoms. They are the main source of energy for the human body. Carbohydrates are found in foods such as bread, pasta, rice, and potatoes.
Fats are also organic compounds that are made up of carbon, hydrogen, and oxygen atoms. They are a source of energy for the human body, and they also help to protect the body’s organs. Fats are found in foods such as butter, oil, and meat.
Cellulose is a carbohydrate that is found in the cell walls of plants. It is a major component of wood, paper, and cotton. Cellulose is a non-digestible fiber that is important for the digestive system.
In conclusion, the correct answer to the question “Silk fibre chemically is” is C. protein.