What is the action of ergotamine?

Choice A rationaleErgotamine does not increase hypoperfusion. It is used to constrict blood vessels to reduce blood flow.Choice B rationaleErgotamine does not decrease hypoperfusion. It is used to constrict blood vessels to reduce blood flow.Choice C rationaleErgotamine does not increase hyperperfusion. It is used to constrict blood vessels to reduce blood flow.Choice D rationaleErgotamine decreases hyperperfusion by constricting blood vessels in the basilar artery vascular bed, reducing the blood flow to relieve migraine headaches. .