Building a dynamic web app for questionnaire

I am interested in a building a web app that displays, for every new visitor, a specific set of questions to be answered. The set of questions to be displayed are selected from a pool of database and are not supposed to be the same for every visitor. More precisely, the questions are selected based on the set of answers already received from previous workers. For e.g., if the goal is to get only n answers (from n different visitors) for every question, then the app should check how many answers have been collected for a given question already and select new questions accordingly. Is wordpress suitable for building this kind of app ? If yes, please point to the appropriate resources (docs/plugins etc). If not, do you recommend any other framework or writing code from scratch (for e.g. in PHP/MySQL) is the only option ? I am not very comfortable with rails and is perhaps an overkill for such a simple application.