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 Q]: 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 A]: yes

[EX Q]: Question: Does abrogation of early apoptosis alter late inhibition of hippocampal neurogenesis after irradiation?
Answer: Early apoptotic death of neural progenitors, endothelial cells, or both does not have a causative association with late inhibition of neurogenesis after irradiation.
[EX A]: no

[EX Q]: Question: Does corn oil enhancing hepatic lipid peroxidation induced by CCl4 aggravate liver fibrosis in rats?
Answer: corn oil enriches polyunsaturated fatty acids through COX-2 independent pathways to increase LPO products that do not enhance liver fibrosis induced by CCl4.
[EX A]:
no