A cavity containing pus surrounded by inflamed tissue is.. An abscess

A cavity containing pus surrounded by inflamed tissue is:

• A- Cellulitis.
• B- An abscess.
• C- Extravasation.
• D- An adhesion.

Out of the options you provided, the best answer for a cavity containing pus surrounded by inflamed tissue is: B. An abscess.

Here's why:

- Cellulitis:

This is a diffuse bacterial infection of the skin and underlying tissues, not a localized cavity with pus. It wouldn't typically form a specific cavity like you described.

- Extravasation:

This refers to the escape of a fluid (such as blood or medication) from its intended vessel or container into the surrounding tissues. It doesn't involve the presence of pus or inflammation.

- Adhesion:

This is an abnormal connection between two normally separate tissues or organs. It wouldn't involve pus or inflammation either. 

- An abscess:

This is a localized collection of pus surrounded by inflamed tissue, which perfectly matches your description. It forms as the body's immune system tries to wall off an infection. Bacteria or other foreign particles can trigger an abscess to form.

Therefore, an abscess is the most accurate term for a cavity containing pus surrounded by inflamed tissue.