Which of the following is an example of a closed head injury?

A closed head injury refers to damage that occurs to the brain without a visible wound or break in the skull. In this context, a contusion is indeed an example of a closed head injury, as it involves bruising of the brain tissue due to a blunt force impact, while the skull remains intact.

In contrast, other options like a skull fracture and an open laceration involve breaks in the skull or the skin, which are indicative of open head injuries. A cerebral hematoma, which is a collection of blood outside of blood vessels in the brain, may also arise from closed head injuries, but it does not specifically describe the nature of the injury type itself. Therefore, while a cerebral hematoma can occur as a consequence of a closed head injury, it does not meet the criteria for being classified solely as such.