Child with cold finger tips

A 9-year-old white female comes to your office complaining of painful, cold finger tips which turn white when she attends evening football games in October and November. While there is no approved treatment for this condition at this time, which one of the following drugs has been shown to be useful?

A.Propranolol (Inderal)
B.Nifedipine (Procardia XL)
C.Ergotamine/caffeine (Cafergot)
D.Methysergide (Sansert)
E.Alcohol (e.g., Budweiser, Lone Star, etc.)