Blister agents include all of the following EXCEPT?

Blister agents, also known as vesicants, primarily include substances like mustard gas, lewisite, and phosgene oxime, which cause severe blistering and damage to the skin and mucous membranes. However, agents such as nerve agents (e.g., sarin or VX) do not fall under the category of blister agents, as they function primarily by disrupting the nervous system rather than causing blisters. Therefore, any mention of nerve agents would be an exception in the context of blister agents.