How to localize random text swift

Complete newbie here though have searched through all the files on here and googled extensively and still can't work it out, so here goes.

I have this in a model.swift file (together with the answers array)

    func getAnswer() -> String {
    var random = Int(arc4random_uniform(UInt32(answers.count)))

    let result = answers[random]
    return result
}

and this in my view controller

@IBAction func getAnswerTapped(sender: AnyObject) {

    answerText.text = model.getAnswer()
    answerText.text = NSLocalizedString("Of course I do...",comment: "")
   answerText.hidden = false

}

This is accessing the localizable.string file as it translates the phrase correctly when I run the app though I can't work out how to localize the randomly generated phrase from the answers array listed in the model.swift file.

What should this line be to do that?

answerText.text = NSLocalizedString("Of course I do...",comment: "")

Thank you. Nicola