Asking One Single Question on Site

Hi, As the site administrator I would like to post one single question on my website and allow visitors to my site to answer. I do not want them to see who posted the question. I do not want them to see any buttons that allow them to ask their own questions. I do not want them to choose categories. I just want them to be able to see the question and then to be able to write a response. But I do like the options that they can vote on answers and filter answers based on votes and responses…these are great features for what I’m after. Is what I am after possible to customize with this plugin? I’d appreciate some guidance on how to achieve the look/layout I am after. And if it is not possible, is there another plugin that allows me to do what I want?