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.

Example Input: Question: Are immunologic marker paths for seroconversion : single determinations of immunoglobulin A and beta 2-microglobulin adequate to estimate time of HIV infection . Multicohort Analysis Project Workshop . Part II?
Answer: Further study of how serum IgA reflects HIV infection and careful clinical and statistical assessment of reduced beta 2M from 5 or 6 years after HIV infection are needed. The dependence of marker paths on mode of HIV transmission suggests that sexual transmission may have implications for HIV disease progression. The feasibility of using serum IgA and beta 2M, evaluable in single stored blood samples, to estimate time of HIV infection has been set back by our results.
Example Output: no

Example Input: Question: Does revaccination with Bacillus Calmette-Guerin ( BCG ) vaccine reduce morbidity from malaria in African children?
Answer: We found no evidence that BCG revaccination reduces morbidity from malaria.
Example Output: no

Example Input: Question: Do nitric oxide synthase gene knockout mice become hypertensive during pregnancy?
Answer: There was no apparent increase in systolic blood pressure in any of the 3 nitric oxide synthase gene knockout strains during pregnancy compared to the wild-type control mice. This suggests that, at least in the mouse, genetic deficiency of any 1 isoform of nitric oxide synthase does not result in pregnancy-induced hypertension.
Example Output:
no