How do you deal with someone who blatantly asks if you had nose surgery?

Half a year after I got my nose job,,, I went to a gathering for the first time in years,,, and it was the first time we had seen each other in half a year~ But one guy came and saw me and asked if I had plastic surgery~ Not only other people, but even my family didn't know except for my mom,, but the older sisters and brothers around me said that wasn't true and that if I really didn't trust them , they should just tell me to get my nose done,,, I thought I just had to get over it for this moment , so I just made a gesture of putting my hand up and lifting my nose with the palm of my hand,, Anyway, I just let it go this time , but what if they keep asking me next time,, It was n't that noticeable and if I said I got my nose done,, oh,, rumors spread like wildfire,,