Time fer another riddle!

You're a victorious leader, returning from battle after a hard slog out on the battle fields. You are given an audience with the king who has 3 identical daughters - identical in every respect apart from, one daughter always tells the truth, one of them always lies and the third sometimes lies and sometimes tells the truth (completely random).
Now no-one knows which is which - not even the king, but he promises you the hand in marriage of whichever one you decide. Now you think to yourself that marrying the truth teller would be okay and even marrying the liar would be okay ('cos at least you'd know where you stand with her), but you must, at all costs, avoid marrying the other one.
You get to ask one question to only one of the three daughters (you obviously don't know which one you'll be asking).

What question do you ask to ensure that you don't end up marrying the middle daughter Question?

Please spend a few seconds reading this though i know its long but its quite interesting.

Msg me if u know the ans!

Going out now to meet matt and the rest. Byebye!