Currently, when flagging an off-topic question, the following choices are offered.
Questions about general computing hardware and software are off-topic for Stack Overflow.
Questions concerning problems with code you've written must describe the specific problem and include valid code to reproduce it.
Questions must demonstrate a minimal understanding of the problem being solved.
Questions on professional server, networking, or related infrastructure administration are off-topic for Stack Overflow unless they directly involve programming or programming tools.
Questions asking us to recommend a tool, library or favorite off-site resource are off-topic for Stack Overflow as they tend to attract
opinionated answers and spam.
This question belongs on another site in the Stack Exchange network
However, there are some questions that fit in none of these categories. For example, career advice questions are off-topic here (and on programmers.SE), questions like this one about an iPhone not connecting to WiFi are off-topic on pretty much any SE site.
Some questions might also be relevant on another SE site not listed when the "belongs on another site" option is selected.
How should those questions be flagged? Why isn't there a "it's off-topic because it is" option?
EDIT: just to be clear, I don't have the "Other" option under Off-Topic.