For a single individual, all of the above is true, but for a large enough sample size, the answers may be more generally useful because you account for all of those rounding errors.
I am not afraid to say this is poorly designed.
I wouldn't describe teal as blue or green any more than I'd describe purple as red or blue, so being forced to pick felt silly. Like being forced to choose my seventh favorite Norwegian glacier - technically its a valid question but my answer is necessarily going to be arbitrary.