Which of the following is among the odors MWDs are trained on?

• A. Dinitrobenzene
• B. Ammonium nitrate
• C. Triphenyl phosphate
• D. Zinc oxide

Answer: (B)

MWDs are trained on odors that reflect real-world explosive components they are likely to encounter. Ammonium nitrate is a key part of many explosive formulations (notably ANFO) and has a distinct, detectable odor that dogs can be trained to recognize and alert to. This makes it a practical and common training odor for explosives Detection.

The other substances are not standard odors used in typical MWD explosive training. Dinitrobenzene is a toxic chemical primarily used in chemical synthesis, not a routine training odor for field explosives. Triphenyl phosphate is mainly used as a flame retardant/plasticizer, not an explosive component. Zinc oxide is a mineral used in paints, rubber, and cosmetics and does not represent an explosive odor dogs are trained to detect.

So ammonium nitrate stands out as a realistic, widely used odor for MWD training, which is why it’s the correct choice.