Which Assessment Is Most Important to Perform Before Administering a Bronchodilator

Which assessment is most important to perform before administering a bronchodilator by inhalation?

A) Listening with a stethoscope to the patient's breath sounds.
B) Measuring blood pressure in the sitting and standing positions.
C) Asking questions to assess the patient's cognition and mental status.
D) Checking the oral mucous membranes for white or cream-colored patches.