There are four types of Chemical Warfare Agents (CWA). Which CWA prevents blood from providing oxygen to tissues and organs?

Blood agent

Explanation:

chemical warfare agents are of four major types:

nerve, blister, choking and blood agents

Nerve agents - it attacks the central nervous system and can enter the body through inhalation

Blister agents - it attacks skins and it is rapidly absorbed by the skin cells

chocking agents - as name denoted, it is related to the respiratory system.

Blood agent - it attacks the circulatory system of the body. it prevents the circulation of blood into the tissue and organs