What the question asks is if you can create a "reference to an interface". That's a bit vague, and I can see where there is room for disagreement, but in my opinion Remco's answer qualifies. Also, though Tony is probably busy right now, I know that when this same question came up recently on Marcus' group, he thought an anonymous class would qualify.
I see two possible interpretations:
(1) A "reference to an interface" is something that can never exist, since an interface cannot be instantiated, and the phrase is essentially meaningless. Then the rest of the question is irrelevant, and the answer is false.
(2) A "reference to an interface" is shorthand for "a reference to an instance of a class which implements an interface". Then an anonymous class does qualify, and the answer is true.
Is there another possible meaning of the phrase I've missed? The second one makes sense to me. Look at the method addActionListener() in Button and other classes. What kind of argument does it take? An ActionListener. Well, a reference to an ActionListener. Well, really a reference to a class which implements ActionListener. But we usually accept the first as an acceptable shorthand, and only use the second or maybe third when we need to distinguish between a reference and the object it refers to.
So, I think the question is fine as is. Yeah, I know that's out of character for me.
I'm gaining respect for how difficult it can be to write a clear, unambiguous test question.