An example of an anticoagulant rodenticide is?

Warfarin is indeed an example of an anticoagulant rodenticide. It functions by inhibiting vitamin K epoxide reductase, which is essential for the synthesis of clotting factors in the liver. This leads to a depletion of clotting factors such as prothrombin, causing the affected animals to bleed to death over time, as their ability to form clots is severely compromised.

In contrast, red squill is a natural rodenticide that works through a different mechanism, primarily linked to its toxic properties affecting the heart and central nervous system. Cyanide gas is a highly toxic compound that affects cellular respiration rather than acting as a rodenticide specifically. Malathion is an insecticide that disrupts the normal functioning of the nervous system of insects, not rodents, and does not have anticoagulant properties. Therefore, warfarin stands out as the correct answer due to its specific action as an anticoagulant used in rodent control.