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 premature immunosenescence associated with memory dysfunction in rheumatoid arthritis?
Answer: RA patients had reduced memory performance compared to healthy controls. Expansion of activated and senescence-associated T cells was correlated with poor memory performance.

Ex Output:
yes


Ex Input:
Question: Is the WFS1 ( Wolfram syndrome 1 ) a major susceptibility gene for the development of psychiatric disorders?
Answer: Our results suggest that WFS1 is not a major susceptibility gene for the development of psychiatric disorders in our population.

Ex Output:
no


Ex Input:
Question: Does down-regulation of microRNA-155 attenuate retinal neovascularization via the PI3K/Akt pathway?
Answer: The results revealed that the downregulation of miR-155 attenuated retinal neovascularization via the phosphatidylinositol 3-kinase (PI3K)/Akt pathway.

Ex Output:

yes