You will be given a definition of a task first, then some input of the task.
Given a passage with a question and an answer to that question, classify if the answer actually answers the question into 'yes' or 'no'. Output 'yes' if the answer answers the question and output 'no' if the answer does not answer the question.

Question: Does the transcription factor Ap-1 regulate monkey 20-hydroxysteroid dehydrogenase promoter activity in CHO cells?
Answer: Our results indicate that the Ap-1 site (-281 -274) (5'-TGTCTCAT-3') plays a crucial role in the activation of the monkey 20-HSD gene. Thus, we demonstrated that monkey 20-HSD promoter activity is regulated by the transcription factor Ap-1 in CHO-K1 cells.
Output:
yes