What type of contaminants in milk are harmful to human health?

Pesticides are harmful contaminants in milk that can pose serious health risks to humans. These chemicals, used in agricultural practices to control pests and weeds, can enter the milk supply through feed, water, or direct contamination during the milking process. Consumption of milk containing pesticide residues can lead to various health issues, including hormonal disruptions, developmental problems, and even increased risk for certain cancers.

In the context of milk quality, it is critical to monitor and regulate pesticide levels to ensure safety for consumers. The other options, while they can also be harmful, may not be as directly associated with milk in terms of widespread regulation or public health concern. Heavy metals, bacteria, and detergents can also be contaminants in dairy products, but pesticides are particularly significant due to their agricultural ties and potential for widespread exposure.