Which of the following is an example of a single-dose anticoagulant rodenticide?

• A. Bromethalin
• B. Zinc-phosphide
• C. Bromadiolone
• D. Vitamin D3

Answer: (C)

Single-dose anticoagulant rodenticides are highly potent anticoagulants that can deliver a lethal dose after a single feeding by disrupting the vitamin K cycle and preventing the formation of clotting factors. Bromadiolone fits this category as a second-generation anticoagulant designed to be effective after one meal, unlike older first-generation anticoagulants that typically require multiple feedings over several days to accumulate a lethal dose.

The other options are not anticoagulants: bromethalin is a neurotoxin that affects the nervous system; zinc phosphide releases toxic phosphine gas; vitamin D3 (cholecalciferol) is a non-anticoagulant rodenticide that causes toxic effects through calcium imbalance.