Golden Fibre refers to jute, which is the correct answer according to the question. Jute is a natural fiber that is commonly grown in tropical regions, including India and Bangladesh. It is considered to be a golden fiber because of its lustrous golden color, which gives it its distinctive appearance.

Option 1: Hemp is a different type of fiber that is extracted from the Cannabis sativa plant. It is known for its strength and durability, but it is not referred to as the golden fiber.

Option 2: Cotton is a widely used natural fiber that comes from the cotton plant. While cotton is an important textile fiber, it is not commonly referred to as the golden fiber.

Option 4: Nylon is a synthetic fiber that was developed as a substitute for silk. It is not referred to as the golden fiber.

In conclusion, jute is known as the golden fiber due to its natural golden color, which sets it apart from the other options provided.