You don’t, you have the option to say neither, or “Prefer not to say” and we are happy with that. However this year we are honoured to introduce the Ada Lovelace Prize for best female code breaker, sponsored by BCS. It would be a bit difficult to award it without knowing who qualifies. We recognise that “neither” could look a bit dismissive and we did consider a range of other options, but in practice we don’t need to know so probably shouldn’t be asking, though that might change in the future. Another good reason to collect this data is to get a picture of what the National Cipher Challenge community looks like so we will use this data, in aggregate, for reporting purposes, but we will not share it with anyone else.