Which of the following insects injects venom by sting?

Fire ants are known for their ability to inject venom through their stings. When disturbed or threatened, they can aggressively defend their nests, and their sting can be quite painful, often resulting in a burning sensation followed by itching and the formation of pustules. This mechanism of delivering venom helps them to incapacitate their prey or deter predators.

In contrast, termites, bed bugs, and house flies do not have the capability to sting and inject venom. Termites primarily feed on wood and are more likely to cause structural damage than an immediate physical threat to humans. Bed bugs feed on blood through bites, but they do not inject venom; their bites can cause allergic reactions but lack the venomous sting aspect. House flies do not sting; they are more associated with transmitting diseases through contamination as they feed and breed in unsanitary conditions.