Either or?

Zoe was running around like a wild thing this evening and I was trying to pin her down long enough to find out what she wanted for the rest of her dinner, having already eaten the main part of it. I was being lenient and letting her sit in the "big girl chair" at the table, instead of using her highchair, and as a result, she was very distracted. Finally, I said, "Zoe! Do you want a yogurt or string cheese?" She replied absently, "I want a yogurt or."