Which of the following is NOT a primary route of exposure to pesticides?

The correct answer indicates that surface contact is not considered a primary route of exposure to pesticides in the same way that the other options are. Primary routes of exposure typically involve direct interactions with the body that can lead to pesticide absorption.

Skin exposure occurs frequently for those applying pesticides because it can happen through direct contact, leading to dermal absorption. Ocular exposure is also a significant concern in pesticide applications, as pesticides can accidentally be splashed or drift into the eyes, causing irritation or potential harm. Oral exposure occurs when pesticides are ingested, either through contaminated hands or via accidental ingestion, making it another critical route of concern.

Surface contact is more about the pesticide being on an environment or material rather than being a method by which a person can be exposed in a direct or harmful way. While surface contact can lead to secondary exposures (for instance, if a person touches a contaminated surface and then touches their face), it does not represent a primary route of exposure where a pesticide directly interacts with the body in a manner leading to immediate absorption. Thus, the distinction lies in the directness and immediacy of that interaction in terms of risk to human health.