How can I store multiple values in json?

pretty simple question.

I am trying to learn polymer and have made a survey. For one of the questions I would like to assign multiple values as the answer but for some reason I can only get it working with one value.

"survey": [

        {
            "type": "picker",
            "question": "Please rate out of 5",
            "min": 1,
            "max": 5,
            "answer": 5
        }, 

This returns a positive result when the user selects 5 but when the user selects 1-4 it is incorrect.

What I would like to do is store multiple values in the 'answer' field so that if the user selects 1-5 they all register as correct.

How can I do this? I have tried

[1, 2, 3, 4, 5]

and it still doesn't work.