Answer:
Option C, expectorants
Explanation:
Guaifenesin, known by brand name Robitussin, and potassium iodide (SSKI), though they do no belong to the same pharmacological class, are both considered expectorants.
These medications reduce the viscosity of mucus, thereby loosening these secretions, and allowing them to be expelled from the respiratory tract via coughing.
They do not have antitussive (cough suppressant) properties because this action would combat their own mechanism of action.
These two medications are expectorants, option B.
