True or False: A pesticide with an oral LD50 of 5 mg/kg is more toxic than one with an LD50 of 250 mg/kg.

The statement is true because the LD50 (lethal dose for 50% of the test population) is a commonly used measure of the toxicity of a substance. A lower LD50 value indicates that a smaller amount of the substance is required to achieve a lethal effect, which signifies higher toxicity. In this case, a pesticide with an oral LD50 of 5 mg/kg is indeed more toxic than one with an LD50 of 250 mg/kg, as it requires significantly less of the former to cause harm compared to the latter. Thus, when evaluating the safety and risk associated with these pesticides, understanding the LD50 values is critical in determining their relative toxicity.