regarding using prompts, dropdowns.

Hi, I want to know how can I add a list of say 60 names in an automatic way rather than in manual way as a drop down list. Basically what I want to do is this: Say I ask the survey respondent a questipn like : Tell me about your friends. --> Which course of study they are in?---> Then once they choose the course of study, I want the survey to take them to a list of all student names in that course of study so that the reposndent can choose who their friend. Can you please help this is really urgent?! This is like what happens in Google.