Violation
Administration of which of the following drugs would produce vasoconstriction of the gingival vessels? a. Levonordefrin b. Phentolamine c. Epinephrine d. Propranolol e. Phenylephrine
(a), (c) and (e)
(a) and (b)
(a) and (c) only
(b), (d) and (e)
(b) and (d) only