Which of the following may occur when the lungs are exposed to noxious gases and the irritant reflex is activated?
           I. Ventilatory rate increases
          II. Reflex cough
         III. Sneeze
         IV. Bronchospasm

A. I and III only
B. I, II, III, and IV
C. I, II, and III only
D. I and III only


Answer: B

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