First, you can ignore it and focuse on "selling" you, your abilities and even some of your philosophy about work or your feild and say something like I would be delighted to share the private details of my salary history with you in person.
Second, if you feel you MUST give some kind of number, just state a range that includes your medical, dental, othe benefits and expected bonuses. You might state, for example, "my current compensation, including benefits and bonuses, is in the range of "#####-$&&&&&"
Hope that helps.