A construction worker in an enclosed space with cyanide gas is suffering from what type of poisoning?

The correct answer is that the construction worker is suffering from poison from inhalation because cyanide gas is a highly toxic substance that can be inhaled directly into the lungs. When an individual inhales cyanide gas, it enters the bloodstream rapidly and can cause serious health effects or death.

Inhalation poisoning is particularly critical in enclosed spaces due to the lack of adequate ventilation, which can cause gas to accumulate and reach dangerous concentrations very quickly. This method of exposure is prevalent with gases or vapors, where immediate respiratory distress can occur, making it vital for workers to have proper ventilation and respiratory protection in environments where such hazards exist.

Other forms of poisoning listed, such as ingestion, absorption, and injection, are not applicable in this scenario as they involve different routes of entry into the body. For example, ingestion refers to consuming a toxic substance, absorption involves toxins entering through the skin, and injection pertains to substances directly entering the bloodstream via a needle. In this case, the immediate and harmful effects from the cyanide gas are due to inhalation, confirming the choice made.