[Interesting, a question in response to his own question, and not the sort of question B expects, either. The others who have replied up to now all rightly assumed - or at least asked - that he was inquiring after a person. This though ... ]
It's not a what, it's a who. [His tone is bland as he makes the correction.] Someone I've been working with. A colleague, you might say.
audio
It's not a what, it's a who. [His tone is bland as he makes the correction.] Someone I've been working with. A colleague, you might say.