There are four types of Chemical Warfare Agents (CWA). Of the four, which agent tends to demonstrate the onset of symptoms immediately and signs of exposure include slurred speech, paralysis, depression, headache, reduced vision, and convulsions?

NERVE AGENT

Explanation:

A chemical weapon agent (CWA) is a chemical substance whose toxic properties are used to kill, injure or incapacitate human beings. The four types are: choking agent, blister agent, blood agent and nerve agent.

Nerve agents are chemicals that affect the nervous system. The health effects are similar to those produced by some pesticides. The main nerve agents are the chemicals sarin (GB), soman (GD), tabun (GA) and VX. The health effects occur more rapidly.

Signs of exposure to nerve agents are: pinpoint pupils of the eye, excessive production of mucous, tears, saliva and sweat, headache, stomach pain, nausea and vomiting, chest tightness and shortness of breath, loss of bladder and bowel control, muscle twitching, seizures, coma, death.

Therefore, out of the four, the agent which tends to demonstrate the onset of symptoms immediately and signs of exposure (include slurred speech, paralysis, depression, headache, reduced vision, and convulsions) is NERVE AGENT.