Final answer:
Injures the tissues of the respiratory system.
Step-by-step explanation:
The correct answer is a. Injures the tissues of the respiratory system. An irritant is a substance that causes irritation or inflammation when it comes into contact with living tissues. It can lead to symptoms such as coughing, sneezing, and difficulty breathing. Examples of respiratory irritants include smoke, dust, and certain chemicals.
Learn more about Toxic effects of substances on the respiratory system