what is the only unanswerable question? this is also a seemingly unanswerable question indicating that there are multiple sets of unanswerable questions waiting to be answered

Stop asking unanswerable questions.

People may not have enough information to answer it.

Actually, you can if you ignore the warning. That seems to be there to help prevent unanswerable questions. Unanswerable questions often start with which. For instance:

"Which of the following is the correct answer?"

That is the type of questions they try to keep off the site since they cannot be answered.

this is impossible. lets think. a questions requires an answer otherwise it is not a question, thus meaning an 'unanswerable' question DOES NOT EXIST. yar. yogurt pot.