OK. You'll be given the following question. Please do chain-of-thought reasoning.
One of the following sentences is nonsensical. Which one is it?\nOptions:\n- Sentence A: "I was riding on the back of a friend's while"\n- Sentence B: "I was riding on the back of a friend's bicycle"\n
User
A while isn't a thing that can be ridden on.
Thus, the answer is Sentence A.
Assistant