I have not faced that questiong, yet. Good answer though albeit I think just responding “it is non of yours or the governments business.” is the proper answer. Remember, when they start inputing all that health related info into national data bases. This is setting the plate for the Stassi to come seize your guns for your own safety and that of “the Children”.
The trouble is these questions always hit when you are least expecting them or are distracted, like when you are sick and need a doctor. My natural inclination is to tell the truth, but you can’t afford to be honest and open in Amerika these days. My new policy is to volunteer no information to anyone, and when I am compelled to give information I give as little as possible.