Hopefully the upcoming MCQ exam will have a lot of questions like this one I saw today:
Here is a medical investigation finding. Which of the following statements is true?
A. This can be found in normal people.
B. This can be found in X syndrome.
C. None of the above.
D. All of the above.
Logically, the answer can't be D, since then the answer would be (A,B, and neither A nor B). So my odds just improved from 1 in 4 to 1 in 3. Sweet as bro!