Given the task definition and input, reply with output. 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.

Question: Are cerebrospinal fluid -amyloid and tau associated with risk of delirium : a prospective cohort study in older adults with hip fracture?
Answer: Cognitive impairment predisposes to delirium, but in this study, postoperative delirium was not associated with baseline CSF A1-42, tau, and Ptau levels. These findings suggest that CSF markers for plaque and tangle formation are not strongly associated with delirium risk in older adults with hip fracture.
no