I'll give you a question, please answer with step-by-step reasoning process.
Which of the following two sentences does not make sense?\nOptions:\n- Sentence A: "It is perfectly normal for adults to have teeth fall out."\n- Sentence B: "It is perfectly normal for children to have teeth fall out."\n

Sentence A
The teeth in an adult's mouth should be permanent.

.

Final answer: Sentence A