Well, if you define 'exposition' on Google, you will get definitions like, "a systematic interpretation or explanation (usually written) of a specific topic". Many say that expositions are a logical manner of expressing oneself about or on a certain topic. Also, in an exposition, all the statements are taken to be true.In my opinion, whoever you are, you can give your opinion, without any restrictions. The question that remains to be asked is, so what is an exposition for?