A Patient Comes to the Clinic and Tells the Nurse

A patient comes to the clinic and tells the nurse she might be pregnant.She has migraine headaches.The physician prescribes dihydroergotamine (DHE 45) .The nurse explains to the patient that this drug is being used for which reason?

A) This agent dilates vessels.
B) This agent does not have oxytocic effects.
C) This agent has no toxic effects.
D) This agent does not cause dependence.