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: Does presence of the full-length KIR2DS4 gene reduce the chance of rheumatoid arthritis patients to respond to methotrexate treatment?
Answer: Our results suggest that the response of RA patients with medium ESR values to MTX treatment may be dependent on the full-length KIR2DS4 gene.

Ex Output:
yes

Ex Input:
Question: Is vincristine-induced neuropathy in the rat modified by drug-drug interactions with the P-glycoprotein inhibitor verapamil?
Answer: Behavioral pain tests did not reveal an increase in vincristine neurotoxicity following combination treatment with verapamil and vincristine. This regimen only led to a slight increase in general toxicity.

Ex Output:
no

Ex Input:
Question: Does uterine artery impedance to blood flow on the day of embryo transfer predict obstetric outcome?
Answer: Uterine artery PI and RI on the day of embryo transfer were unrelated to the risk of the pregnancy ending in spontaneous abortion or ectopic pregnancy. These values were of no value in the prediction of IUGR, PIH or preterm birth.

Ex Output:
no