Which of the following is an effect of OC spray?

The effect of OC spray, commonly known as pepper spray, includes an involuntary closing of the eye. This reaction occurs because the active ingredient in OC spray, capsaicin, causes intense irritation to the mucous membranes, including those of the eyes. When a person is exposed to OC spray, the pain and discomfort lead to a natural reflex to shut the eyes tightly, which is an involuntary response to alleviate the distress caused by the spray.

This specific physiological reaction is critical in law enforcement and self-defense scenarios, as it can impair a person's vision, providing a tactical advantage in de-escalating a situation or detaining a combative individual. The immediate impairment of vision can disorient and distract the individual, allowing for safer handling of the encounter.

In contrast, the other options do not accurately reflect the effects of OC spray. Enhanced vision is not a result of exposure to OC spray, and the idea of immediate paralysis is also incorrect; while OC spray can incapacitate temporarily, it does not cause paralysis. Additionally, increased stamina is not associated with the use of OC spray; rather, the spray is intended to hinder an individual's ability to fight or flee.