From the following list, which oral LD50 value represents the most toxic pesticide?

The oral LD50 value indicates the lethal dose required to kill 50% of a test population, typically measured in milligrams of substance per kilogram of body weight (mg/kg). A lower LD50 value signifies higher toxicity because it means that less of the substance is needed to cause lethal effects.

In this case, the value of 30 mg/kg is the lowest among the options provided. This indicates that just 30 milligrams of this pesticide per kilogram of body weight is sufficient to produce a lethal effect in half of the tested population. Thus, it represents the most toxic pesticide listed, as it requires the smallest amount of the pesticide to achieve a deadly outcome. Higher values, such as those of 585 mg/kg, 320 mg/kg, and 65 mg/kg, reflect lower toxicity levels, requiring more of the substance to be equally lethal.