Nasal septum gets damaged. Its recovery requires cartilage known as

The correct option is hyaline cartilage.

To understand why this is the correct answer, let's break down the anatomy of the nasal septum and the types of cartilage involved:
1. Structure of the Nasal Septum: The nasal septum is the partition separating the left and right nasal cavities. It consists of both bony parts and a cartilaginous part. The anterior (front) portion of the nasal septum is made up of a supportive cartilaginous plate.
2. Type of Cartilage in the Septum: The specific type of cartilage that forms this septal framework is hyaline cartilage. Hyaline cartilage is the most abundant type of cartilage in the human body. It is characterized by a smooth, pearly-bluish, glassy appearance and contains fine collagen fibers (primarily Type II collagen) embedded in a firm, gel-like ground substance.
3. Role in Recovery/Repair: If the cartilaginous nasal septum gets damaged, its regeneration and structural recovery rely on the division and activity of chondrocytes located within the perichondrium and the matrix of the existing hyaline cartilage.
4. Distinction from Other Cartilage Types:
- Elastic cartilage contains abundant elastic fibers, giving it high flexibility (found in the external ear and epiglottis).
- Fibrous cartilage (fibrocartilage) is highly collagenous and extremely tough, designed to withstand deep compression (found in intervertebral discs).
- Calcified cartilage is an intermediate state where calcium salts are deposited within the cartilage matrix, typically during bone formation or aging.

Therefore, because the nasal septum is structurally composed of hyaline cartilage, its recovery and repair require hyaline cartilage.