Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: Of the drugs reviewed, which one is used in the prophylactic treatment of migraine ?: 
 Options:  <1> Dihydroergotamine <2> Meperidine <3> Flunarizine <4> Chlorpromazine <5> Sumatriptan
