Which of the following is NOT classified as dangerous goods?

Perishable food products are generally not classified as dangerous goods. Dangerous goods typically refer to items that pose risks to health, safety, property, or the environment during transportation due to their hazardous nature. This includes substances that are explosive, flammable, toxic, or reactive.

In contrast, perishable food products do not carry those hazardous characteristics. They may require careful handling and specific environmental conditions to maintain freshness, but they do not fall under the dangerous goods classification that would trigger stringent safety regulations during transport.

On the other hand, batteries, flammable liquids, and compressed gases all have recognized potential hazards. Batteries can leak toxic substances, flammable liquids pose a risk of fire or explosion, and compressed gases can lead to explosions or asphyxiation hazards if not handled correctly. Therefore, these items are classified as dangerous goods due to their inherent risks.