There is mathmatical truth which until "String Theory" seemed to convey an intrinsic quality of correctness or "truth". What else qualifies?

If you are sworn in as a witness in a court case you aver to tell the Truth, the Whole Truth and nothing but the Truth--- then they begin trying to make you answer yes or no to questions that beg explanation. Are they getting the Whole Truth? Are you telling the Whole Truth? What's the Truth?