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 nonoperative immediate weightbearing of minimally displaced lateral compression sacral fractures result in displacement?
Answer: : Immediate weightbearing, tempered by patient comfort, is a safe and acceptable treatment for minimally displaced LC sacral fractures and results in union with minimal additional displacement.

Ex Output:
no


Ex Input:
Question: Is allocentric but not egocentric orientation impaired during normal aging : an ERP study?
Answer: These results suggest that elderly individuals present with deficits when spatial orientation relies on allocentric representation, and are associated with age-related deficits in spatial attention.

Ex Output:
yes


Ex Input:
Question: Is promoter polymorphism of cyclooxygenase-1 ( COX1 ) associated with ulcerative colitis in the Japanese population?
Answer: This research suggests that COX1 promoter polymorphisms (T-1676C and A-842G/ C50T) may not be associated with the risk of developing ulcerative colitis in a Japanese population.

Ex Output:

no