Final answer:
A contusion is not an open tissue injury because it does not break the skin; it is characterized by bruising and damaged blood vessels under the skin.
Step-by-step explanation:
The student asked which of the following is NOT an open tissue injury:
- Avulsion
- Abrasion
- Contusion
- Evisceration
The answer is C. Contusion. A contusion is a type of tissue injury that is characterized by bruising and damage to the blood vessels under the skin but does not break the skin, therefore, it is not an open injury. In contrast, avulsion, abrasion, and evisceration are all types of open tissue injuries where the skin is torn, worn away, or organs are protruding, respectively.