Which of the following is NOT classified as a vesicant agent?

Vesicant agents, also known as blister agents, are chemical agents that cause severe blistering of the skin and mucous membranes upon exposure. Examples include Lewisite, sulfur mustard, and phosgene oxime, all of which have properties that lead to this type of injury through toxic chemical burns.

Sarin, on the other hand, is classified as a nerve agent. Rather than causing blistering, it disrupts the normal function of the nervous system by inhibiting the enzyme acetylcholinesterase, leading to a series of severe neurological symptoms. This fundamental difference in mechanism and type of injury categorizes sarin distinctly from the vesicant agents mentioned.

Understanding the classifications of these agents is crucial for first responders and medical professionals when assessing potential exposure scenarios and determining the appropriate treatment methods. The distinction between vesicants and nerve agents like sarin underlines the varied responses required for chemical exposure, which is vital knowledge in emergency medical situations.