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Question:

Which of the following best describes stage four of a decubitus ulcer?

A Open area of skin with damage that reaches to the joint, bone or tendons.
Explaination

The damage to the joints, bones or tendons is considered as a sign of stage four. Stage one is redness, Stage two would be redness as well as an open sore, and stage three will show signs of blackened skin or a crater-like appearance.