What is an acute toxic effect of penta exposure?

The option indicating irritation to eyes, skin, and respiratory tract is correct because pentachlorophenol (often referred to as penta) is known to be a toxic compound that can cause immediate adverse reactions upon exposure. Acute toxicity from penta often manifests as irritation, which can affect various organs and systems, particularly when there is direct contact or inhalation.

When penta enters the body, it can provoke responses such as redness, swelling, and discomfort in the affected areas, especially on the skin or in the mucous membranes of the eyes and respiratory tract. The severity of these reactions can vary depending on the level of exposure and individual sensitivity.

In contrast, the other options do not align with the known effects of penta exposure. Enhanced respiratory function or an immediate energy boost would falsely suggest beneficial effects of exposure, which is not the case with a toxic substance like penta. Lastly, claiming that there are no observable symptoms would contradict the established understanding of acute toxic effects, as symptoms such as irritation are typically among the first signs that indicate exposure to toxic chemicals.