Which of these is an example of a traumatic injury?

A sprained ankle is indeed an example of a traumatic injury. Traumatic injuries occur as a result of an external force or sudden impact that causes damage to the body. In the case of a sprained ankle, this typically happens when the ankle is twisted or rolled, resulting in the stretching or tearing of ligaments that support the joint. This is a direct physical injury that occurs suddenly during an activity or due to an accident.

In contrast, bronchitis and smoke inhalation are more related to respiratory issues rather than traumatic physical injuries. Bronchitis involves inflammation of the bronchial tubes, generally due to infection or irritants, and is not caused by a specific traumatic incident, while smoke inhalation refers to damage from inhaling toxic fumes, which is also not classified as a traumatic injury in the same context.

Similarly, a back strain, while it certainly involves injury and can be painful, is often the result of prolonged use, overexertion, or improper lifting techniques rather than a specific traumatic event. Therefore, when considering the definition of traumatic injury, a sprained ankle stands out as the clear example in the list provided.