Explanation:
Inflammation is the process in which the active immune system employs many cells to the affected tissue. It is a complex biological response of vascular tissues to harmful stimuli, such as pathogens, damaged cells, or irritants.

Steps in the inflammatory process:

1. Recognition: The immune system recognizes the presence of harmful stimuli, such as pathogens, damaged cells, or irritants.

2. Vascular changes: The affected tissue releases chemicals that cause the blood vessels to dilate, increasing blood flow to the area. This causes redness and warmth in the affected area.

3. Leakage: The blood vessels become more permeable, allowing fluid and immune cells to leak into the affected tissue. This causes swelling and pain in the affected area.

4. Immune response: Immune cells, such as white blood cells, are recruited to the affected area to fight off the harmful stimuli.

5. Tissue repair: The inflammatory process helps to remove the harmful stimuli and damaged tissue, and promote tissue repair.

Functions of inflammation:

1. To eliminate the initial cause of cell injury or damage.

2. To remove damaged cells and tissues.

3. To initiate tissue repair and regeneration.

4. To activate the immune system.

5. To limit the spread of harmful stimuli.

Types of inflammation:

1. Acute inflammation: It is a rapid and short-lived inflammatory response that typically occurs in response to infection or injury.

2. Chronic inflammation: It is a prolonged inflammatory response that occurs in response to persistent or recurring stimuli, such as autoimmune diseases or chronic infections.

Conclusion:

Inflammation is a complex biological response of vascular tissues to harmful stimuli, such as pathogens, damaged cells, or irritants. It is a crucial process that helps to eliminate the initial cause of cell injury or damage, remove damaged cells and tissues, initiate tissue repair and regeneration, activate the immune system, and limit the spread of harmful stimuli.

Option D is correct