Finding a value for a question variable

I am trying to limit the function of a button on a question page (the "next" button). If it is a T/F question, I can simply set a condition on the button itself: if question "is correct", and it works just fine. The next button is completely inoperable until the correct answer is selected.When I use a multiple-choice question and set the condition: if question is correct, the next button continues to work whether the question is correct or not. Is that a bug?Either way, I can set a variable "equal to". So if I can figure out what that value is for the correct answer, I should be able to obtain the same effect, right?

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