Castlevania: Lords of Shadow 2 -
You'll be given a choice as to which one is the real Marie. This is random so I can't give you the correct answer, but it is pretty easy to figure out as one of them will sound more sincere and kind than the other. Another good point is the fake Marie will talk in a more desperate tone (ie. I am the real one) and the real Marie gives more of a "You know deep inside what the answer is."