Which one of the following was used as a chemical weapon in the first world war ?

Which one of the following was used as a chemical weapon in the first world war ? Correct Answer Mustard gas

Although the Germans were the first to use phosgene on the battlefield, it became the primary chemical weapon of the Allies. Phosgene was responsible for 85% of chemical-weapons fatalities during World War I. Mustard gas, a potent blistering agent, was dubbed King of the Battle Gases.
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