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.

Ex Input:
Question: Is cytoglobin upregulated by tumour hypoxia and silenced by promoter hypermethylation in head and neck cancer?
Answer: We conclude that the CYGB gene is regulated by both promoter methylation and tumour hypoxia in HNSCC and that increased expression of this gene correlates with clincopathological measures of a tumour's biological aggression.

Ex Output:
yes


Ex Input:
Question: Is hyperglycemia associated with increased risk of patient delay in pulmonary tuberculosis in rural areas?
Answer: Patient delay appears to be a serious problem in this rural area with a high prevalence of tuberculosis. Hyperglycemia is independently associated with an increased probability of patient delay, which, in turn, may result in more serious clinical manifestations.

Ex Output:
yes


Ex Input:
Question: Do soy protein isolates of varied isoflavone content influence serum thyroid hormones in healthy young men?
Answer: Results of this study demonstrate that soy isoflavones in a protein matrix do not significantly influence circulating thyroid hormones in healthy young men.

Ex Output:

no