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 single copy of variant CYP2A6 alleles confer susceptibility to liver dysfunction in patients treated with coumarin?
Answer: No evidence was obtained that the studied polymorphism in CYP2A6 is a determinant of the coumarin-associated liver dysfunction.

Ex Output:
no


Ex Input:
Question: Does progression rates and sample size estimate for PPMS based on the CLIMB study population?
Answer: Our modern PPMS cohort is demographically similar to previously studied cohorts. PPMS is associated with faster disability accrual than ROMS. Current real-world observations of time to sustained progression will inform design of new clinical trials for PPMS.

Ex Output:
yes


Ex Input:
Question: Does unbound bilirubin increase during ibuprofen treatment of patent ductus arteriosus in preterm infants?
Answer: Ibuprofen (10-5-5 mg/kg) did not displace bilirubin in preterm infants with a baseline TB concentration <8.8 mg/dL.

Ex Output:

no