[quote=mdk]
In that case, there's only one option that reads '50% chance.' You have only one chance of drawing it (out of four), thus, you have a 25% chance to answer correctly.
[/quote]
Technically it's 33.3% not 50% (with elimination) because Choice A and D are exactly the same but that's by using eliminating reasoning not random selection. So the 50% is completely wrong. So you'd be left with best choice of 25% as it's closest under eliminative reasoning.

By random it's not 25% because although the content of itself has no bearing on your random selection, there's three possible results
- A = D, thus both A and D are correct - 50%
- B is correct then it's 25%
-C is correct so it's 25%
 
Average of the three gives us the magical 33.3% again.