When asthma attacks, the patient can hardly breathe. Which of the following should probably be administered to the patient?
a. norepinephrine, to relax smooth muscle in the bronchioles and increase airflow
b. antihistamine, to counteract the bronchoconstriction caused by histamine
c. ACh, to increase bronchoconstriction
d. a and b are correct
e. a, b and c are correct