Correct Answer (Detailed Explanation is Below)
A.
Eyes and respiratory tract
Detailed Explanation
Tear gas primarily irritates the eyes, skin and respiratory tract. Exposure can cause tearing, burning sensations, coughing and difficulty in breathing. CS and related irritants act on sensory nerve endings. In general science questions, remember the association of
tear gas with lachrymatory agents and chemical irritation rather than with a poisonous gas category.