Before administering epinephrine to a patient who is having an asthma attack, you should always obtain a medication history from the patient because:

a. the patient already may have severe cardiac irritability from an overdose of bronchodilators from a home inhaler.
b. medication in inhalers tends to antagonize the effects of epinephrine.
c. the combination of epinephrine with drugs the patient has already taken may worsen bronchospasm.
d. the combination of epinephrine with drugs the patient has already taken may slow the patient's heart.

a