**Question:** Essential granulation tissue constituents include all except

A. Collagen
B. Elastic fibres
C. Fat cells
D. Blood vessels

**Core Concept:** Granulation tissue is a type of connective tissue that forms during the wound healing process in response to injury or tissue damage. It plays a crucial role in tissue repair and regeneration. Essential constituents of granulation tissue include cells, blood vessels, and extracellular matrix components such as collagen and elastic fibres.

**Why the Correct Answer is Right:** Among the given options, fat cells are not considered essential constituents of granulation tissue. Fat cells are part of adipose tissue, which is distinct from granulation tissue and forms in different locations within the body.

**Why Each Wrong Option is Incorrect:**

A. Collagen: This is a crucial component of granulation tissue, providing structural strength and elasticity to the regenerating tissue.
B. Elastic fibres: Similar to collagen, elastic fibres contribute to the tissue's elasticity and recoil, ensuring proper tissue function and recovery.
C. Fat cells: As mentioned above, fat cells are part of adipose tissue and not granulation tissue.

**Clinical Pearl / High-Yield Fact:** Understanding the distinction between granulation tissue and adipose tissue is essential for proper wound healing and tissue regeneration. Disturbing fat cell regeneration can lead to complications in wound healing and negatively impact the final tissue quality.

**Correct Answer:** **C.** Fat cells