She's the university teacher.
The book I'm using lists "She's a university teacher." as the only correct option.
Struggling to understand why this wouldn't be an appropriate response if there were only one university teacher in the room.
You're right, The sentence is not incorrect.
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anonymousif there were only one university teacher in the room
Yes, but even if there were only one university teacher in the room, she would also be "a" university teacher. Having only one in the room doesn't really help us distinguish between "a" and "the".
In fact, it would make more sense if there were two teachers in the room — one a university t