Urgent! Forgot security question for DS-160

[duduwqr]

I made an interview appointment in May and now I need to print the confirmation page of my DS-160. I tried to retrieve application on the website, but the security question is " the given name of my mother's mother", I don't remember I answered this question when I field the form, I entry the answer they always shows that the answer is incorrect. Btw, I also try to use different browser,but the security question is still that one.
Does anyone help me to figure out what to do.?

Thanks
.